It'd be foolish to think the Republican Smear Machine would take a pass on Obama no one, least of all the Obama campaign, believes this but, as far as I can tell, the argument seems to boil down to a candidate who is struggling against the presumptive GOP nominee or a candidate who might struggle against the presumptive GOP nominee.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2008/02/against-mccain/220044/
