In this Jan. 23, 2007, file photo, Sen. Barack Obama, D-Ill., left, and Sen. Edward Kennedy, D-Mass. watch President Bush's State of the Union address on Capitol Hill in Washington. Kennedy will endorse Obama for president, party officials confirmed on Sunday. Carolyn Kennedy also has endorsed Obama. (AP Photo/Charles Dharapak, File)

Question: Why are so many D's picking a relative newcomer over a party stalwart like Hillary Clinton?

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