Maybe. I'll give President Bush this much: He believes most of what he says and does. No matter how delusional that may make him, it still makes him a lot more sincere than Thompson. Thompson is not entering this race because he's got some grand political vision. He's not doing it because he's a "Clean up Washington" Outsider, much as he'd like you to forget all the lobbying and years spent getting rich in the Capitol.
He's running because he sees the party crying out for Ronald Reagan again, and he think he can fool everyone into believing that he's him. He's running because, like always, he's an opportunist.
The only people less sincere than Fred in the race are Hillary and Romney. I'm not voting for any of them, unless two of them are facing each other.