WHEN it comes to the business of elections, Louisiana likes to confound conventional wisdom. While most of its Southern neighbours were busy electing Republicans during the early 2000s, Louisiana stubbornly returned a Democrat, Mary Landrieu, to the Senate in 2002, and put another one, Kathleen Blanco, in the governor's mansion in 2003. Now, as Republican fortunes have sagged across the nation—in no small part because of the Bush administration's failure to cope with Hurricane Katrina's devastation of Louisiana's coast in 2005—the party is having a banner year in the state. Atop the scorecard is the Republicans' reclamation of the governorship,...