When Americans think about campaign finance, they usually picture wealthy donors, political action committees and super PACs pouring money into elections.

But some of the most revealing money moves happen inside Congress itself.

Members of the U.S. House of Representatives routinely give campaign money to fellow members of their own party. These transfers make up only a small share of total campaign spending, but they can reveal something important: how parties reward influence, support vulnerable candidates and organize power from within.

In our recent study, my research colleague and I analyzed campaign contributions exchanged among House members from 2009 to 2022, using data from the Federal Election Commission. We looked at who gave money to whom across seven election cycles and asked a simple question: Are these decisions mostly ad hoc, or do they follow clear political patterns?

We found that they are far from random. Internal campaign giving reflects the structure of party politics in the House. Senior members and party leaders are more likely to be givers than receivers, and members facing pressure from outside spending are more likely to attract support from their party colleagues. We also found that Democrats and Republicans organize these campaign contributions differently.

A hidden side of campaign finance

Campaign contributions between House members are legal, common and publicly reportable. In practice, these transfers can help members build alliances, strengthen their party standing and direct........

© The Conversation