The correct answer is soft money.
Soft money is the unregulated money given to the political party and not to a candidate meant for party building. The money can originate from an individual, corporations or political action committee. Hard money on the other hand is regulated money (political donations) by law through the federal election commission. McCain-Feingold act was an act that amended the federal government election campaign act in 1974, which regulates the funding and financing of political parties.
