Soft money

Campaign finance in the United States is the financing of electoral campaigns at the federal, state, and local levels. At the federal level, campaign finance law is enacted by Congress and enforced by the Federal Election Commission (FEC), an independent federal agency. Although most campaign spending is privately financed, public financing is available for qualifying candidates for President of the United States during both the primaries and the general election. Eligibility requirements must be fulfilled to qualify for a government subsidy, and those that do accept government funding are usually subject to spending limits on money.

Races for non-federal offices are governed by state and local law. Over half the states allow some level of corporate and union contributions. Some states have limits on contributions from individuals that are lower than the national limits, while four states (Missouri, Oregon, Utah and Virginia) have no limits at all. This article deals primarily with campaigns for federal office.

In 2008, candidates for office, political parties, and independent groups spent a total of $5.3 billion on federal elections. The amount spent on the presidential race alone was $2.4 billion, and over $1 billion of that was spent by the campaigns of the two major candidates: Barack Obama spent $730 million in his election campaign, and John McCain spent $333 million. The total amount spent by Obama and McCain was a record at the time.

In the 2010 midterm election cycle, candidates for office, political parties, and independent groups spent a total of $3.6 billion on federal elections. The average winner of a seat in the House of Representatives spent $1.4 million on his or her campaign. The average winner of a Senate seat spent $9.8 million.

The money for campaigns for federal office comes from four broad categories of sources: (1) small individual contributors (individuals who contribute $200 or less), (2) large individual contributors (individuals who contribute more than $200), (3) political action committees, and (4) self-financing (the candidate's own money). In the 2010 Congressional races, the sources of campaign contributions broke down as follows:

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