"Howard Berman is a highly-respected leader sought after by his colleagues from both parties for his expertise in both domestic and foreign policy, and world affairs,” Hoyer said in a statement posted on the Berman campaign's Facebook page. “Howard Berman is respected by both Republicans and Democrats because of his approach as a legislator and decency as an individual. It would be a great loss to the country if Howard Berman did not return to serve in the Congress of the United States."

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The two lawmakers were thrown into the same district by California's redistricting process. And the state's new primary system puts the top two vote-getters — regardless of party — in the general election. Most of the district is Sherman's old territory.

The race has caused many Democratic legislators to pick sides.

Berman already received an endorsement from Rep. Xavier BecerraXavier BecerraOvernight Tech: States sue FCC over net neutrality repeal | Senate Dems reach 50 votes on measure to override repeal | Dems press Apple on phone slowdowns, kids' health | New Android malware found States sue FCC over net neutrality repeal Justice Department to appeal court's DACA ruling MORE (D-Calif.), the House Democratic caucus vice chairman. In total, Berman holds endorsements from more than 20 House members and five senators — including both senators from California and a few Republicans. He secured the endorsement of Sens. John McCainJohn Sidney McCainMcCain rips Trump for attacks on press NSA spying program overcomes key Senate hurdle Meghan McCain says her father regrets opposition to MLK Day MORE (R-Ariz.), Lindsey GrahamLindsey Olin GrahamDHS chief takes heat over Trump furor Overnight Defense: GOP chair blames Dems for defense budget holdup | FDA, Pentagon to speed approval of battlefield drugs | Mattis calls North Korea situation 'sobering' Bipartisan group to introduce DACA bill in House MORE (R-S.C.) and Joe Lieberman (I-Conn.) earlier in the race.

Sherman holds the endorsement of three members of Congress and has secured the high profile support of former President Bill ClintonWilliam (Bill) Jefferson ClintonTrump’s first year in office was the year of the woman Can a president be impeached for non-criminal conduct? Dems search for winning playbook MORE.