The Hillary Clinton Campaign released a video starring Jack Nicholson today. The spot consists of a statement from Nicholson along with him in character as The Joker, Col. Jessup (A Few Good Men), and Jake Gittes (Chinatown). Watch it:
Commissioner Gordon, Batman, and Robin all declined comment. Barack Obama is said to be preparing a video response dressed as Bat Girl, to appeal to his more liberal fans. John McCain was quoted as Sylvester Stallone's character, John Rambo, "Remember who drew first blood." His YouTube video response will presumably be done with him dressed as president.
Personally, I think "One Flew Over the Cukoo's Nest."