CommitteeNegative spending against Republicans in primaries (millions $)
CLUB FOR GROWTH ACTION4.6
MISSISSIPPI CONSERVATIVES1.6
ENDING SPENDING ACTION FUND1.5
TEXANS FOR A CONSERVATIVE MAJORITY1.1
US CHAMBER OF COMMERCE1
SENATE CONSERVATIVES ACTION0.85
AMERICAN CROSSROADS0.77
VALUES ARE VITAL0.75
TEA PARTY PATRIOTS CITIZENS FUND0.74
AMERICAN UNITY PAC INC0.66