NEW ORLEANS -- The Republican playbook for deposing Sen. Mary Landrieu of Louisiana was fine-tuned in Washington and battle-tested with glorious results elsewhere in the South: Recruit a plausible challenger. Unleash attack ads skewering the Democrat on taxes and abortion. And for the grand finale, bring in President Bush to campaign at the Republican candidate's side. But something went wrong in the Bayou State. Landrieu, who just a week ago seemed to fit the GOP blueprint's definition of a vulnerable incumbent, held off the challenge and won a convincing victory in a runoff election Saturday. She beat the Republican, elections...