Warren Buffett vouches for GM with Caddy purchase

American billionaire Warren Buffett says he's "behind GM 100%" and he even bought one of their cars to prove it. Buffett decided to buy a Cadillac DTS after seeing GM CEO Rick Wagoner on CBS's Face the Nation in early April. He faxed Wagoner a note that praised him for being "candid, composed, and rational" in his discussion of problems GM faced.