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Let's say you were dreaming up the perfect stealth candidate for 2008, a Democrat who could step into the presidential race when the party confronts its inevitable doubts about the front runners. You would want a candidate with the grass-roots appeal of Barack Obama—someone with a message that transcends politics, someone who spoke out loud and clear and early against the war in Iraq. But you would also want a candidate with the operational toughness of Hillary Clinton—someone with experience and credibility on the world stage.