How Does Money Influence Politics: PACs, Lobbying, and Dark Money

Money influences American politics through several parallel channels, each with its own rules. A voter can write a capped, publicly disclosed check to a candidate. A wealthy donor can give unlimited sums to a Super PAC that runs ads for that same candidate. A corporation can route money through a nonprofit that never has to name its donors. And an industry can hire former lawmakers to lobby their old colleagues on specific bills. Understanding how money influences politics means understanding all four lanes, because the rules that govern one barely touch the others.

What an Individual Can Legally Give a Candidate

The Federal Election Commission sets contribution limits under the Federal Election Campaign Act, and those limits adjust for inflation every odd-numbered year. For the 2025–2026 cycle, you can give up to $3,500 per election to a federal candidate’s campaign committee. Primaries and general elections count separately, so the practical ceiling per candidate is $7,000 across a full cycle. You can also give up to $5,000 per year to a national party committee and up to $132,900 per year to additional national party accounts earmarked for conventions, legal proceedings, and headquarters buildings.¹

This is called “hard money.” Every dollar is reported to the FEC, and the data is searchable by anyone. The transparency is genuine. But hard money covers a shrinking share of what actually gets spent in a federal election.

Traditional and Leadership PACs

A political action committee pools smaller contributions from employees, union members, or association members. Once a PAC has been registered for at least six months, has more than 50 contributors, and has given to at least five federal candidates, it qualifies as a multicandidate committee and can donate up to $5,000 per election to a candidate.¹

Corporations and unions cannot fund PACs from their general treasuries.² A company-affiliated “connected” PAC has to raise its money through voluntary contributions from executives and employees, then distribute those funds to candidates.

Members of Congress often run their own leadership PACs on the side. These are separate committees a lawmaker controls but that sit outside their campaign. A senator uses a leadership PAC to collect contributions and steer them to other candidates, which builds alliances and internal party influence. The same PAC limits apply, but the purpose is power-brokering rather than campaigning.

Super PACs and Unlimited Outside Spending

The Supreme Court’s 2010 decision in Citizens United v. Federal Election Commission held that the government cannot restrict independent political expenditures by corporations, unions, or other groups, on the ground that such spending is protected speech under the First Amendment.³ Weeks later, the D.C. Circuit ruled in SpeechNow.org v. FEC that contribution limits to groups making only independent expenditures were unconstitutional.⁴ Those two rulings built the legal foundation for Super PACs.

A Super PAC can raise unlimited amounts from individuals, corporations, and unions. It can spend that money on television ads, digital campaigns, mailers, and other communications that expressly support or oppose a candidate.⁵ The one meaningful restriction is independence. A Super PAC cannot coordinate its spending, messaging, or strategy with the candidate it supports.⁶ If it does, the expenditure is treated as an in-kind contribution and hits the normal caps.

Super PACs do disclose their donors to the FEC, which matters. But the scale of their spending routinely dwarfs what candidates raise directly. A single billionaire can fund a Super PAC with tens of millions of dollars, and in a competitive presidential cycle, Super PACs collectively spend hundreds of millions. This is the “big money in politics” many voters have in mind: technically transparent, but concentrated in a small number of donors who decide which candidates get visibility.

Dark Money: When You Cannot See the Donor

The biggest transparency gap involves nonprofit organizations that spend on politics without disclosing where their money came from. “Dark money” is the term for political spending where the original source is hidden.

The main vehicle is the 501(c)(4) social welfare organization. The IRS lets these nonprofits engage in political activity as long as it is not their primary purpose.⁷ What counts as “primary” is a facts-and-circumstances test rather than a fixed percentage. The IRS weighs the share of money going to political activities, the staff time involved, and the other resources the group commits.⁸ In practice, a 501(c)(4) can spend a substantial minority of its budget on political ads without losing its exemption.

Here is the key point. Unlike Super PACs, 501(c)(4) organizations are not required to publicly disclose their individual donors to the FEC. Someone can give millions to a social welfare organization, that organization can spend the money on ads attacking or supporting a candidate, and the public never learns who wrote the check. Trade associations organized under 501(c)(6) work the same way for industry.

A 501(c)(4) can also donate to a Super PAC. When it does, the Super PAC’s disclosure lists the nonprofit as the donor, not the people who actually funded it. This layering is one of the most common paths dark money takes into a federal race. Legislative proposals like the DISCLOSE Act have tried to require nonprofits to reveal their donors when they spend on elections. None has passed.

Who Cannot Give at All

Some sources of political money are barred entirely, and the prohibitions carry real consequences.

Foreign nationals. Anyone who is not a U.S. citizen or lawful permanent resident cannot make contributions, donations, or expenditures in connection with any federal, state, or local election. Soliciting or accepting such a contribution is equally illegal.⁹
Corporate and union treasuries, for direct contributions. Citizens United freed corporations and unions to make independent expenditures, but they still cannot contribute directly to federal candidates from their general treasuries. Their route is a connected PAC or a Super PAC.²
Straw donors. Giving money to someone else to contribute in their name, or reimbursing someone for a contribution, is a federal crime. That includes companies handing employees bonuses earmarked for donations. The FEC’s civil penalty for a straw donor scheme runs from 300% to 1,000% of the amount involved.¹⁰¹¹
Federal contractors. Individuals and companies holding active federal government contracts cannot contribute to candidates, parties, or PACs.

Lobbying: Where Money Meets Legislation

Campaign giving gets the headlines, but lobbying is where money does its most granular work on actual bills. Lobbyists meet with lawmakers and staff, deliver technical research, and press for specific outcomes in legislation and regulatory proceedings. Federal lobbying spending exceeded $5 billion in 2025, which is larger than the hard-money side of the equation.

The Lobbying Disclosure Act requires firms and organizations to register with the Secretary of the Senate and the Clerk of the House once their lobbying activity crosses set thresholds. As of January 2025, a lobbying firm must register when its income from a particular client exceeds $3,500 per quarter. An organization with in-house lobbyists must register when its lobbying expenses exceed $16,000 per quarter.¹² Registered lobbyists then file periodic reports naming the issues they worked on, the chambers and agencies they contacted, and the income they received.

Noncompliance is not trivial. A knowing failure to file or correct a defective registration can carry a civil fine of up to $200,000. A knowing and corrupt violation can bring criminal penalties of up to five years in prison.¹³

Gifts, Travel, and Bundling

The Honest Leadership and Open Government Act of 2007 sharply curtailed what lobbyists can give members of Congress.¹⁴ Registered lobbyists and their employers generally cannot provide gifts of any value to members or staff. The ban reaches meals, event tickets, charitable donations made at a member’s request, and reimbursement for officially connected travel. Narrow exceptions exist for personal friends, but even those are capped at $250 unless the relevant ethics committee approves. That closed a long-standing channel through which relationships were cultivated over expensive dinners and trips.

When a registered lobbyist collects and delivers multiple individual checks to a candidate, a practice called bundling, extra disclosure kicks in. Once bundled contributions exceed a threshold (adjusted annually for inflation from a $15,000 statutory base), the receiving committee has to report the lobbyist’s name and the total amount.¹⁵ Bundling is legal, but the disclosure rule exists because a lobbyist who hands over $500,000 in individual checks has far more influence than any one $3,500 donor.

The Revolving Door

The most valuable lobbyists are often former members of Congress and senior executive officials. They know the decision-makers personally and understand the internal pressure points of the legislative process, and that access commands premium fees.

Federal law imposes cooling-off periods. Former House members must wait one year before lobbying their former colleagues; former senators must wait two years.¹⁴ On the executive side, senior officials face a one-year ban on lobbying the department or agency where they worked. The most senior officials, including those paid at the top executive pay levels and certain White House staff, face a two-year ban on contacting a broader range of executive branch appointees.¹⁶

Violating these post-employment restrictions is a criminal offense. A standard violation can bring up to one year in prison and a fine; a willful violation raises the ceiling to five years. The Attorney General can also seek civil penalties of up to $50,000 per violation or the amount of compensation the person received for the prohibited conduct, whichever is greater.¹⁷

Critics note that cooling-off periods only bar direct lobbying contact, not behind-the-scenes advisory work. A former senator who cannot yet call old colleagues can still join a lobbying firm, shape its strategy, and appear at industry events where lawmakers are present. The door slows. It rarely closes.

Political Contributions Are Not Tax-Deductible

One point catches many donors off guard. Political contributions are not tax-deductible. The IRS treats contributions to political organizations and candidates as nondeductible because these groups do not qualify as charitable organizations, and the same rule applies to money earmarked for lobbying.¹⁸ Whether you give $50 to a local campaign or $100,000 to a Super PAC, none of it reduces your federal tax bill. That is a fundamental difference from charitable giving and worth remembering before writing the check.

1
Federal Election Commission. Contribution Limits for 2025-2026
2
eCFR. 11 CFR 114.2 – Prohibitions on Contributions, Expenditures and Electioneering Communications
3
Justia Law. Citizens United v. Federal Election Commission
4
Federal Election Commission. SpeechNow.org v. FEC – Court of Appeals Opinion
5
Federal Election Commission. Registering as a Super PAC
6
Federal Election Commission. Making Independent Expenditures
7
Internal Revenue Service. Political Activity and Social Welfare
8
Internal Revenue Service. Political Organizations and IRC 501(c)(4)
9
Office of the Law Revision Counsel. 52 USC 30121 – Contributions and Donations by Foreign Nationals
10
Federal Election Commission. Contributions in the Name of Another Are Strictly Prohibited
11
Office of the Law Revision Counsel. 52 USC 30109 – Enforcement
12
Office of the Clerk. Lobbying Disclosure
13
U.S. Senate. Penalties
14
GovInfo. Public Law 110-81 – Honest Leadership and Open Government Act of 2007
15
Federal Election Commission. Lobbyist Bundling Disclosure Threshold Raised
16
Office of the Law Revision Counsel. 18 USC 207 – Restrictions on Former Officers, Employees, and Elected Officials of the Executive and Legislative Branches
17
Office of the Law Revision Counsel. 18 USC 216 – Penalties and Injunctions
18
Internal Revenue Service. Publication 526 (2025) – Charitable Contributions