WASHINGTON -- The roster of aspiring presidential candidates seems to grow by the week here in the nation's capital, where the season of speculation and seduction is in full blossom. Never mind that the urgent political matter for Republicans and Democrats is the fight for control of Congress, considering Election Day is less than six months away. These days, two questions rise above most others in the echo chamber: Who, exactly, is flirting with a bid for the White House and is Sen. Barack Obama among them? It's a ritual that unfolds every four years, at this very time, when...