He's espoused some conservative values, but if I had to put money on it I'd bet he voted for Kerry. I've known quite a few lifelong dems who actually have very conservative values, but they were raised to be dems so that's how they vote. Blacks are pretty tightly under the dems control right now, Kerry got around 90% of them, so chances are that included Bill Cosby (assuming he even voted, a suprisingly high number of celebs don't even bother).
Yet they are the first to gripe!