I have some longer comments on the spot over at Tapped, but I have to admit to being basically unimpressed with the ad. Not the execution of it, which is certainly slick, but the argument. It's overwrought! What you really want to do is get Hillary and Obama into the "I'm a Mac, I'm a PC" spots. For instance, this ad, with Hillary playing Hodgeman's character and babbling at Obama about spreadsheets, would actually be better and more apt when applied to the two candidates than it is for the two computers.
Update: Or this one! Hillary's campaign is totally made for balancing checkbooks, while Obama's is there to stimulate imaginations.