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Seems more like garden variety politics to me.
Obama and his surrogates have hit out at McCain as too old, too angry and even suggested that the McCain campaign would (gasp!) tell people that Obama is black. ("I don't look like all those presidents on our dollar bills.") McCain is waging a campaign right back and hitting at Obama on areas where he feels there is a soft spot that can be exploited.
Like I said, it's politics. It's a contact sport. Obama will need to hit back...but drop the whole race angle that he used against the Clinton's because McCain and his campaign will throw it right back at 'em.
The trend lines in the polls are worrisome if you support Obama, heartening if you support McCain. But then there are old Dems like me who don't want either one and think that no matter who wins, the nation loses. We'll see. If I were forecasting, I'd say that McCain wins this fall. The bloom is off of the Obama rose.