Can you celebrate the Obama presidency at NBC? Yes you can. If you're a fan of all things Obama, NBC Universal's online store has no fewer than 29 options for your buying pleasure -- from a shirt with the president's picture proclaiming "YES WE DID"...to both of his books...to a special inauguration DVD...to a refrigerator magnet of the first couple. And don't forget the Barack Obama Action Figure -- yours for $15, plus tax. You can buy them online -- or at NBC Universal's retail store in New York. Some analysts say it's good business, that NBC is simply offering...