No he would not. No one knows who he is, not even democrats. No democrat candidate has been as little known, not even Obama.
I am talking hypotheticals here. I agree he is too unknown to win their nomination. But what I am saying is that he would beat Romney IF he was their nominee. He would win Tennessee and maybe other red states. I don’t think Romney can win over Obama, but I am certain he couldn’t beat a moderate self-made businessman like Bredesen.