Oh stop. When's the last time you supported a Democrat for an office of any importance?
A very long time, but it's possible in theory.
I'm considering voting for Lieberman for the Senate.
I have voted for Democrats on the local level because there's no difference between Democrats and Republicans on that level.
Whether I vote for the man or the party, the result is the same, so it's a distinction without a difference. Unless the Republican candidate is to the left of the Democratic candidate, I'll usually go with the Republican.