Ban corporate donations, and limit personal donations to a relatively small sum. Ron Paul for example is getting millions every month from donations made by people alone. This should be the status quo, not the exception.

But most politicians right now they know they couldn't gather as much money as they'd like this way, because they know there aren't that many enthusiastic people who love them enough to give them money. So getting money from rich people or corporations is a shortcut to being elected.