I will not vote for anyone who is against my second amendment rights. No conservative would vote for someone like that.
The RudyBots may think that it's just awful that such neanderthal "single-issue" voters won't support their guy. Ah, well... c'est la guerre.
In truth, I'm not a single-issue voter. I care about a number of issues, on several of which Giuliani has an unacceptable position. The Second Amendment issue, though, is the first tripwire for me. Rudy can't even clear that first hurdle in order for me to consider him on other issues.
You've gotta start somewhere in appraising these candidates; I just so happen to start with the RKBA - and I suspect many others do, too.