Obama Vs. Mc Cain

I went to pick up my frind's 8 year old son from the surf camp and on the way back he
mentioned President Bush and new presidential candidates. He decided that he's going to vote for Obama. He does not like Mc Cain because he is old and fat and because he is going to listen to
President Bush and his advice if he won the election. He declared he really likes Obama but didn't elaborate.

My question is: Do we need to have more information about a person or is it enough to see them and make conclusion based on their appearance? I mean, MC Cain is old and fat but that does not prevent him from being a good President, right? On the other hand, we've got handsome but less experienced Obama... Who would you choose?