Barack Obama has the type of mind--orderly, analytical, well-read--that takes naturally to the study of ideas. But he's always been uncomfortable describing himself in ideological terms. Is he a liberal? During the campaign, Obama would mock those who applied the label to him: "There's nothing liberal about wanting to reduce money in politics," he'd say. "There's nothing liberal about wanting to make sure [our soldiers] are treated properly when they come home." Is he a moderate?