My world's all topsy-turvy: Rep. Michele Bachmann, the conservative Republican whose values are almost entirely divergent from my own, agreed to sign my name, but Stephen Colbert, whose entire television persona hinges on borrowing the characteristics of others (namely, O'Reilly-esque conservatives not unlike Bachmann) won't.
You'll notice he did use the blank space where the date's supposed to go to sign his own name though. Maybe that's most fitting.