MANCHESTER, N.H. – With standing room crowds chanting for the star to show, Sunday's Democratic fundraiser could have been a rock concert. But it was only Sen. Barack Obama's first visit to the nation's first primary state. If Senator Obama should jump into the Democratic presidential primary, where he is now ranked just behind Sen. Hillary Rodham Clinton of New York in recent polls, Democrats in the land of retail politics wonder if there's a living room big enough to hold the throngs who'd come to hear him. "Right now, he's a rock star. Getting 1,500 people out on a...