Presidential rock-paper-scissors

I was thinking the other day about what I would do if given the chance to play paper-rock-scissors with the presidential and vice-presidential candidates. In a classic one game do or die paper rock scissors contest, what would you throw against each candidate and why? Well that depends on what you think they would throw and why. Here are my guesses:

McCain: He throws rock, unless he feels mavericky he throws scissors. He never throws paper, not aggressive enough.
Palin: Always throws paper. She seems smothering somehow. And remember she said she reads all those papers?

Obama: Tough one. I think Obama throws paper as well. Can't really explain it, maybe because of all those books he wrote.
Biden: Scissor guy, I'm fairly certain. Might be paper as well because of his experience. I don't know why that translates in my head to paper, but it does.

It's a pretty stupid thought experiment I'll admit, but I found it interesting and diverting for a bit.