WASHINGTON (AP) — Unlike Hillary Rodham Clinton, rival Barack Obama planned for the long haul. Clinton hinged her whole campaign on an early knockout blow on Super Tuesday, while Obama's staff researched congressional districts in states with primaries that were months away. What they found were opportunities to win delegates, even in states they would eventually lose. Obama's campaign mastered some of the most arcane rules in politics, and then used them to foil a front-runner who seemed to have every advantage — money, fame and a husband who had essentially run the Democratic Party for eight years as...