WASHINGTON -- A "deeply disappointed" supporter put President Obama on the grill yesterday at a town-hall meeting, telling him that he hasn't lived up to hopes, that she's grown exhausted defending him and that she is fearful about returning to the "hot dogs-and-beans era" of her life because he's not helping the financially strapped middle class. "I've been told that I voted for a man who said he's going to change things in a meaningful way for the middle class. I'm one of those people, and I'm waiting, sir," Velma Hart told Obama. "I'm waiting. I don't feel it yet,"...