Withholding your vote from a Republican is the same as giving a vote to a Democrat. Is that what you really want to do?
So the republicas OWN our votes?
They have a RIGHT to expect our support?
Of course not, but that doesn't change the fact that if you didn't vote for Bush in 2004, that gave one more vote up for Kerry.
Nothing or nobody is perfect - it's always the choice of the lesser of two evils. I know which I think is the greater of the two evils!