Gun owners — and the NRA in particular — are very active in Republican primary politics.

"Gov. Palin is one of the most requested speakers in America today," Wayne LaPierre, the NRA's executive director, said in a statement announcing Palin's speech. "She's an outdoorsman, hunter and a steadfast supporter of our Second Amendment freedom. We are pleased to have a fellow NRA member speak at our 139th annual meeting in Charlotte this May."