By Robert Barnes PHILADELPHIA -- All is sweetness and light these days between Barack Obama and Pennsylvania Gov. Ed Rendell, a staunch supporter of Sen. Hillary Rodham Clinton during the Democratic primaries. So close now that they can tease? At a fundraiser Friday night, Rendell said there was only one problem with the slender senator from Illinois. "Perhaps the only thing I don't like about him is, he's too thin," Mr. Rendell said, and added that a daily cheesesteak from Pat's is what Obama needs. "A cheesesteak, once a day," Obama said when he took the microphone, "and I will have the pleasure of looking like Ed Rendell." They kid because they love. ...