In a sign of the times for his storm-stricken city, New Orleans Mayor Ray Nagin campaigned for re-election on Saturday -- in Houston. Nagin is one of 23 candidates in one of the more unusual mayoral elections in U.S. history because most of the voters now live in other cities. Hurricane Katrina, which struck New Orleans on August 29, scattered almost all the nearly half-million residents of the Louisiana city across the nation and only an estimated 190,000 have returned. The storm killed about 1,300 people and destroyed some 300,000 homes on the Gulf Coast. Houston, 350 miles to the...