If you want my support, get the GOP squared away with regard to the Second Amendment. Or you can run some mealy-mouthed Romney knock-off and see how little support that candidate attracts.
Red flag laws. A growing and increasingly vocal group have made it clear that the very act of purchasing a gun is suspect, making the purchaser a target of gun confiscation laws.
Avoid any negotiation in an attempt to modify these bills to try to appease both those that understand the Second Amendment and those that would do away with it.