Mayoral elections in Houston, San Francisco, other major U.S. cities

(Reuters) - Voters on Tuesday elected - or re-elected - mayors in more than 300 cities across the United States. Here is a snapshot of the major contenders for city hall this election day in some of the largest U.S. cities: City: Houston Population: 2,240,000 Mayoral race: There were 13 candidates in the field to be mayor of Houston, the fourth-most populous U.S. city and center of the country’s energy industry. The two top candidates who are likely headed for a run-off in the nonpartisan