LOS ANGELES (AP) A California legislative leader announced Sunday he will challenge U.S. Sen. Dianne Feinstein, setting up a 2018 contest between two Democrats that will highlight generational, geographic and ideological contrasts in the party that dominates state politics. The 84-year-old Feinstein, a former San Francisco mayor and grande dame of California Democrats, will face state Senate President Pro Tem Kevin De Leon, 50, a Los Angeles Hispanic who is largely unknown statewide.