BATON ROUGE, La. - Even before Hurricane Katrina, the Louisiana Democratic Party was struggling in a conservative state skewing more Republican in its voting tendencies. Voters overwhelmingly backed President Bush for re-election in 2004 and selected their first Republican U.S. senator since Reconstruction. Katrina dwarfed those concerns with even bigger problems: nonstop criticism of Democratic Gov. Kathleen Blanco and the scattering of thousands of residents from New Orleans, normally a Democratic stronghold, amid questions about how many will return. As the Democratic State Central Committee on Saturday chose attorney Chris Whittington as its third state party chairman in less than...