I would have voted for Calvin and Hobbes in the 90s, but since they didn't run, I went with Perot.
On a serious note, I don't think "not voting" is a valid option. It doesn't let politicians know what you think of them. They can't tell a protester from someone that's too lazy to get out and "rock the vote", and they really don't care about the difference. They only have to convince the majority of those that do vote of their ideas, and they're in.
Voting for the lesser of the
evils running for office sends more of a message than a no-vote ever could.