Perversely, very rich Americans are more likely to enter politics because of federal limits on individual donors. When the challenger spends as much as the incumbent, re-election rates are much lower. So wealthy candidates match the incumbent's spending and often succeed in winning. The liberal mainstream media also benefit from campaign finance restrictions. When lobbies and individuals are limited in what they can give to campaigns and political parties, they instead will spend money on advertisements during election seasons.
Media outlets relish the prospect of increased ad revenue.
Although the McCain bill places restrictions just prior to elections on issue ads, which only implicitly support one party or candidate, the media know they will sell even more ads before the restriction period starts. Since the issue ad restrictions raise First amendment questions, the media also know that the Supreme Court likely will forbid such restrictions as unconstitutional. The end result is that mainstream media organizations will have more money and influence than ever before. The media will impact the outcomes of elections even more than they do today. Grass roots organizations and third-party candidates especially suffer when contributions are limited.