Because worst case Bush will be neutral in the gun rights fight and the Democrats will take all your guns away and make it a crime to own a BB gun.
Political success is about convincing a majority of the voters to your view. If a large enough majority of the public wants welfare reform even the leftist Clinton will embrace it as his own. He certainly did. If a large enough majority wants all guns banned even the most right wing politician will support total gun bans.
I can't see you winning a great number of friends or allies that way, in any case.