SAN FRANCISCO (AP) — Six Asian-Americans are vying to be the next mayor of San Francisco.If one of them takes the Nov. 8 election, they will become the first Asian-American voted into office by the city's electorate. Interim Mayor Ed Lee, a Chinese-American, was appointed mayor when Gavin Newsom left office to become lieutenant general in January.San Francisco has the largest percentage of Asian-Americans in the continental United States and the oldest Chinatown in the nation. So the election is being seen as an historic moment in a city where one-third of the residents are Asians, but have traditionally been shut out of public office.One of the most diverse cities in the U.S., there are 16 candidates running for mayor.