The short answer is, a lot of money. Like, a lot a lot. See a recent article fro...

whimsicalism · on Sept 6, 2022

The low tens of millions on digital ads across all senate campaigns. That is definitely not a lot a lot.

pevey · on Sept 6, 2022

This is but one example of one PAC for one party. I don’t know how many PACs exist, but easily hundreds. Thousands? A lot of money is donated to campaigns and PACs across local, state, and national elections, and a lot of that money is spent on advertising of some form, and a lot of that (as the article describes) has been shifted to digital. I would call it a lot a lot.