"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 BecerraHispanics are split in DNC race Becerra launches 2018 bid for full term as California AG The green movement must continue in Trump era 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 McCainMcCain made secret trip to Syria A guide to the committees: Senate Webb: The future of conservatism MORE (R-Ariz.), Lindsey GrahamLindsey GrahamClub for Growth launches ad targeting GOP tax writer Dem senator asks for 'top to bottom' review of Syria policy A guide to the committees: Senate 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 ClintonBill ClintonMoulitsas: Trump’s warped sense of reality Syrian safe zones: Trump's best bet for refugee relief, regional stability Chelsea Clinton attends Muslim solidarity rally in NYC MORE.