Newsweek released a Who Can Win in November article in their print version on December 31st, 2007. It is now one of the lead stories at http://www.barackobama.com/.
A short quote: Barack Obama is "..the only one with a decent chance for a landslide."
And you were wondering why he was channeling Ronald Reagan, eh?
Newsweek - Who Can Win in November?
I could quote their analysis, but I think to do this article any justice I'd have to violate fair use. Go read it yourself.