Republican Assemblyman Eric Linder has been defeated by Democratic challenger Sabrina Cervantes, giving the Democrats an expected supermajority in the California Assembly.

Linder was one of at least two GOP incumbents who lost after last week's election. Assemblyman David Hadley of Torrance also was defeated.

Results from Riverside County showed Wednesday that Cervantes won 53 percent to 47 percent.

Cervantes was previously an aide to Assemblyman Jose Medina of Riverside, who represents a neighboring district. Her victory gives Democrats at least 54 seats in the 80-member Assembly, enough to raise taxes, pass emergency legislation, suspend legislative rules and overturn a governor's veto without any Republican support.

Democrats were on track to add one more Assembly seat as Sharon Quirk-Silva was leading Republican Assemblywoman Young Kim in Orange County.

Linder, 38, was a business owner before turning his attention to politics. He was elected to the Assembly in 2012 and easily re-elected two years ago. He was the only Republican lawmaker endorsed by the Service Employees International Union, which rarely supports GOP candidates.

Linder did not immediately respond to a request for comment made through his Assembly office Wednesday.

In San Jose, union-backed Democrat Ash Kalra defeated fellow Democrat Madison Nguyen, who was favored by the business community. The race was hotly contested by competing interest groups looking to influence the ideological makeup of legislative Democrats.