2. Deadpool
He just wouldn't take it seriously. He wouldn't know how. Ten minutes after being sworn in, he would do something that would put us at war with eleven different countries. And he's probably go fight in every battle he could, leaving his presidential duties at the door. He's a goofball with a screwed psychosis and the idea of him ruling a country is one of the most nightmarish things I can come up. I'm pretty sure it'd be a Mark Millar comic.