Former Labor Department Secretary Hilda Solis (D) and Rep. Xavier BecerraXavier BecerraLuján will have 'assistant Speaker' title California AG Becerra included in Bloomberg 50 list Ocasio-Cortez, Tim Scott, Becerra among Bloomberg's 50 most noteworthy in 2018 MORE (D-Calif.), the chairman of the House Democratic Caucus, are splitting with the Democratic Congressional Campaign Committee and backing attorney Eloise Gomez Reyes (D) in a crowded three-way primary.

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Solis endorsed Gomez Reyes, who is running in retiring Rep. Gary MillerGary Gene MillerTwo lawmakers propose first House bipartisan Ex-Im bill New Dodd-Frank fix runs risk of Lehman-esque meltdown It's official: Dem squeaks through in key California House primary MORE's (R-Calif.) district, on Monday evening. Becerra backed her over the DCCC-backed Redlands Mayor Pete AguilarPeter (Pete) Ray AguilarDeGette dropped from chief deputy whip spot Hispanic Caucus picks Castro as its next chair Progressive rep says she’s ‘very disappointed' by Barbara Lee’s loss in bid for Dem caucus chair MORE (D) and former Rep. Joe Baca (D-Calif.) on Friday.

"Eloise Gomez Reyes is the person for the job," Solis said in a statement released by Gomez Reyes's campaign. "She has spent her entire career fighting for working families and people who can’t fight for themselves. She will bring that same tenacity to the fight to bring jobs to the Inland Empire. Eloise is one tough lady and she will not be intimidated by the extremist leaders of the GOP or their big bank accounts."

Gomez Reyes also has the backing of EMILY's List, which backs Democratic women who support abortion rights. She raised $300,000 last fundraising quarter, more than double what Aguilar brought in, though the two have approximately the same amount of money in the bank at about a half-million dollars apiece.

The Democratic-leaning district east of Los Angeles is a top pickup opportunity, and the DCCC endorsement of Aguilar was designed to make sure a Democrat got through to the general election against Miller.

The congressman's decision to retire has made the district even more likely to flip no matter which Democrats emerge from the all-party primary, which might have made it easier for Solis — and especially for Becerra — to break with party leadership and back Gomez Reyes in the race.

A former Miller staffer has jumped into the race to replace him, giving Republicans a potentially viable candidate, but Republicans acknowledge the district would be very tough to hold onto.