But only a small proportion of Americans make political contributions. Most contributors share a candidate's political ideas. But others give to gain leverage over the legislative process. If an individual or interest group succeeds in getting a favor from Congress in exchange for political contributions, the rest of us usually pick up the tab. For example, a tax break for a large industry ultimately is paid for by all other taxpayers, since the government has to make up the revenue somewhere else.
Money enables candidates to advertise and communicate with voters.
The Supreme Court has ruled that limits on what candidates can spend are unconstitutional. In the early '70s, in response to Nixon-era campaign scandals, Congress passed a series of laws that attempted to limit both political contributions and spending by candidates in congressional and presidential races. Direct corporate contributions were forbidden, and candidates had to disclose their finances. Taxpayer financing was made available for presidential candidates. Spending limits were set.