Leseklick: Wie Geld Wahlen beeinflussen

That’s not to say money is irrelevant to winning, said Adam Bonica, a professor of political science at Stanford who also manages the Database on Ideology, Money in Politics, and Elections. But decades of research suggest that money probably isn’t the deciding factor in who wins a general election, and especially not for incumbents.

FiveThirtyEight - How Money Affects Elections