Jason Horowitz writes from Iowa that Barack Obama’s campaign is giddy, while Hillary Clinton’s is subdued.

He also reports:

Obama strategist David Axelrod took a shot at Clinton pollster Mark Penn and his book Microtrends.

Obama campaign manager David Plouffe said, “All I know is that if the New Hampshire primary were held tonight, we’d win.”

While Superman is helping out Obama’s campaign, Superman’s mom hasn’t been convinced to change sides, and still plans to caucus for Clinton.

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