Obama's first gamble: Clinton at State: "Obama takes a big risk, but the payoff could be worth it. Throughout his political career, Obama has had a tendency to “go big,” as his aides say, with dramatic moves and giant spectacles punctuating his run for president — his head-on race speech, his presidential-style tour of the Middle East and Europe, an acceptance speech held in a football stadium.
The Clinton move, like those, marries an arguably practical choice with lofty symbolism: He’s enlarging his own administration by bringing in one of the leading figures in American politics, and delivering on a promise of a new politics that doesn’t play favorites or hold grudges. See also: Bill can forego income"
(Via Politico.com: Politics '08.)