We lived through the Obama vs. Clinton YouTube smackdowns, and now we're entering the age of Obama vs. McCain. Already Paris Hilton has contributed to a "grassroots" Obama ad which compares McCain to Yoda (hell, it's true that Yoda is a veteran of the Clone Wars). But that brief diss on Yoda gave us an idea. What scifi characters would work best in political attack ads? Take our poll, below, and cast your vote for which scifi attack ads you want to see most.