Another bad solution is a limit on contributions to campaigns. Any such limitation would violate the right of free association and speech. After the Watergate scandal, Congress limited how much anyone including candidatescould contribute to a Presidential campaign. The U.S. Supreme Court ruled that limits on the candidates' personal financial contributions violate their First Amendment rights, but limits on others do not. That, to say the least, was illogical.
Limits also help keep incumbents in power.
Challengers with low name recognition may need large contributions from a few donors to take on an incumbent. If we look at this issue in terms of basic principle we see that the fuss about campaign finance is a clear case of worrying about symptoms while neglecting causes. But donors can buy something only if someone else has something to sell. The problem with the proposals for campaign finance is that they watch the demand side and ignore the supply side. Much of what government does is tax the unorganized majority and distribute the money to well-organized interests.