Just speculating... Perhaps McCain is waiting until after BHO is officially nominated to run on issues and hard facts. Now he is attacking Obama's persona and causing the diehard Dims to rally to BHO's defense. If McCain's campaign is too good too early he will be running against Hillary.
I think you’re right. I’m also thinking that all the stuff out there regarding the guy’s birth certificate...his law degree, his associations etc. McCain is waiting until after the nomination to hit on this, esp if Hillary is gearing up, which it sounds like she might be...