One thing about Newt, I don't think he will be "polite" like McCain was in 2008, and it scares Obama. If Newt wins the nomination, he's going to want to win. His team will talk to people from Obama's past, and get to the bottom of it. Then use what they find in political ads.
You don't THINK he will?
"I don't want to bloody his nose. I want to knock him out!"