Go right ahead. I'm one who won't be voting for McCain. You can rant and rave all you like, but I'll be satisfied in knowing I didn't vote for either liberal choice. Internet posters assigning blame will have no impact on my decision.
When eventually you are asked what you did to prevent Iran from getting the nuclear weapons it has used to kill millions of innocent people, you can explain that your self satisfaction at your own purity prevented you from raising a finger. You can lift your nose in the air haughtily as you do so. But the questioner won't be an internet poster, and that answer would send you straight to a warm place.
But it's your life, toss it away for any triffle you please.