A prominent labor group in the Sacramento region has endorsed Mayor Christopher Cabaldon’s opponent, Greg Potnick, in the West Sacramento mayoral race. The Sacramento Central Labor Council, AFL-CIO, this week endorsed Potnick to become the city’s mayor. Potnick, a former City Council member of 12 years, said he will advocate for working families as part of his campaign. “I’ve been a union member and supporter my entire life,” Potnick said. Cabaldon said Wednesday that he had not yet heard from the labor council on its decision. He said he did not want to comment until he talked to the labor council and learned why it endorsed Potnick. Bill Camp, the executive secretary of the labor cou