You know what would be fun? Going to a Barack Obama or John McCain event and professing your love for the opposite candidate. You don't have to say much, really. Perhaps just, "No, I think (insert rival here) is the better candidate."
Then sit back and watch everybody's panties get in a bunch as they start sputtering shit about the economy and taxes and war and civil rights and government spending and blah-fucking-blah-blah-blah.
Wait about five minutes (or until their faces get all red and they threaten you with bodily harm). You don't even have to fake knowledge of the issues, because they will likely not want to hear what you have to say anyway.
When you've had enough, just say, "Nah, I'm just kidding. I'm not even registered to vote," and walk away.
Of course, this will only work if you have a clear escape route.