Democrat Gil Cisneros captured a Republican-held U.S. House seat in Southern California on Saturday, capping a Democratic rout in which the party picked up six congressional seats in the state. In what had been the last undecided House contest in California, Cisneros beat Republican Young Kim for the 39th District seat. The Cisneros victory cements a stunning political realignment that will leave a vast stretch of the Los Angeles metropolitan area under Democratic control in the House. With Kim’s defeat, four Republican-held House districts all or partly in Orange County, California, a one-time nationally known GOP stronghold southeast of Los...