While there are still some Electoral College arguments in Mitt Romney’s favor, I think it’s actually less likely that McCain will choose him now that he knows his debating opponent will be Joe Biden. Two things I know. 1) McCain despises Romney. 2) McCain despises Romney because he thinks he is a sissy.
In McCain’s mind, sending Romney into a brawl with Joe Biden would be like sending Pee-Wee Herman into the ring with Jack Dempsey. It just wouldn’t be pretty.