LOS ANGELES - Councilman Antonio Villaraigosa unseated Mayor James Hahn on Tuesday to become the city's first Hispanic mayor in more than a century, confirming the rising political power of Latinos in the nation's second-largest city.After a lackluster term tainted by corruption allegations at City Hall, Hahn was turned out of office in favor of a high school dropout and son of the barrio who turned his life around to become speaker of the California Assembly and then a member of the Los Angeles City Council.With 70 percent of precincts reporting, Villaraigosa had 202,861 votes, or 59 percent, to 140,416...