Americans for Prosperity, the conservative superPAC founded and funded by the illustrious Koch brothers', has invested aggressively in targeted Senate races where left-leaning politicians are considered vulnerable. In fact the Senate candidates who saw most spent against them by Americans Prosperity all lost their races.

They are: Mary Landrieu (D-LA), Michelle Nunn (D-LA), Mark Pryor (D-AR), Mark Begich (D-AK), and Bruce Braley (D-IA).

How have other senators fared against similar PAC-spending? Check out who the NRA has targeted below.

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