Ideally people should be able to vote FOR something, as opposed to having to strategically vote for a guy you don't like to avoid getting someone you like even less. I agree with Nathan that lesser evilism is less evil, but it still leaves a bad aftertaste.
The problem is the winner take all system itself. If we had proportional representation, this dilemma would melt away, and progressives wouldn't have to worry about being sold out by New Democrats (and right-wing fascists wouldn't have to worry about being muzzled by compassionate Republicans).
Obviously we don't have proportional representation, and I'm not claiming I have a vision of how to best move in that direction. But I do find it surprising and a bit depressing (note the small 'd') that there isn't more discussion/agitation around this kind of electoral change on the Left.