Barack Obama and his family are vacationing in his native Hawaii, far from the wintry snows of Chicago — and far from almost every other American politician. There’s a metaphor here for how I think Obama is going to conduct himself as president: He’s going to try to keep his distance from other politicians, including his fellow Democrats. I see him trying to remain aloof from his party, much as Dwight Eisenhower did five decades ago. Like Eisenhower, I think he’s drawn the conclusion that his party needs him more than he needs his party.