Facing a GOP primary, he highlights opposition to Obama on Russia, Benghazi and Iran.
The gun rights group's backing gives him a boost against Club for Growth-backed Bryan Smith.
After serving an eight-year racketeering sentence, the La. Democrat is back in politics.
The three conservative senators and nine congressmen have sparred with GOP leadership.
House Majority PAC is launching its third TV buy to shore up Rep. Nick Rahall (D-W.Va.).
Peterson's decision in the GOP-leaning Minnesota district is a relief for Democrats.
The GOP tried to show it's achieving the goals from its post-2012 autopsy.
Paul brings in 16 percent of the vote among Republicans and Republican-leaning independents.
Perry said Kentucky race and midterms are "inextricably intertwined" with country's future.
He said Rep. David Jolly's (R-Fla.) win in Florida's special congressional election is proof.