Mayor Jerry Sanders created some surprising news Tuesday when he endorsed City Councilman Carl DeMaio to be his mayoral successor. His opponent, Congressman Bob Filner, widened his lead in the mayoral race in a poll released the same day ... The relationship between Sanders and DeMaio has been notoriously frosty. Sanders said they don’t talk much and haven’t always gotten along. But Sanders said Tuesday he cared about the city too much to "sit out" the endorsement. ... A 10News and SurveyUSA poll of likely voters out Tuesday put Filner up 12 points over DeMaio, 50 percent to 38 percent....