The National Rifle Association of America advocates for gun rights and claims more than 5 million members.
An environmental group launched in 1969 that targets a “Dirty Dozen” list of politicians for defeat.
A Democratic super PAC formed in 2011.
A traditional political action committee and super PAC hybrid that supports President Donald Trump.
A fiscally conservative super PAC chaired by TD Ameritrade founder Joe Ricketts.
Affiliated Republican groups formed with the help of Republican power players Karl Rove and Ed Gillespie.