For years the standard line is that politicians are influenced by their campaign donors, whose money ensures they can get re-elected. But this is a silly story that doesn't make any sense. It's comically easy to raise money if you're in a swing state/district other ways, and getting re-elected is hardly that big of a prize anyway.
"Wow how did your net worth go up so much while you were in Congress" is a question more and more people should be asking.