The exact moment things changed, vs. Hillary Clinton...

This was during one of the many, many debates among the Democratic nominees (Edwards, Bill Richardson, among others -- current Obama VP nominee Joe Biden is next to Obama and gives him a genuine smile at the end.) When Barack made this cool, collected response after Hillary laughed at him and goaded him ("I want to hear this!"), it was like little David had let that rock fly. It was a big surprise even to his supporters. Direct hit!