It will never be a good idea to leave the Republican Party. Even when they are eventually for abortion except in the case where a couple is purposely trying to prevent the birth of a homosexual child, their positions will be somewhat more tolerable than the Democrats.
And there will be someone on FR who will proudly point that out and call you a traitor for even pondering the idea.
"I said it before, and I'll say it now: The day the Republicans pull a nominee because the Democrats might ask stupid, unfair questions about old, played-out bullcrap and make themselves look even more obnoxious and bitter than they already do...is the day I quit the party."
You can keep on saying it all you want; you're absolutely right. Bowing down to a little controversy at this point would pretty much doom this Presidency and perhaps fatally impact Repub. chances in '08. Bush needs to stick it out. If the party wants to fight a war on the next nominee, they've indicated we're ready to do so, but this one has got to go through.