In other races, Sen. Dianne Feinstein, D-Calif., is on track to win by far the most votes in her quest for a fifth term, while it remains to be seen if the second spot to take her on in November will go to a more liberal rival, former state Senate president Kevin de Leon, or one of several largely unknown Republicans.
James Bradley, a Republican Coast Guard veteran, held a narrow lead over De Leon with 17 percent of precincts reporting. But the two were separated by only several thousand votes and most of Los Angeles County had yet to report.
Meanwhile in New Jersey, Democratic Sen. Bob Menendez, who recently escaped conviction on federal corruption charged in a mistrial, showed signs of weakness Tuesday as he underperformed expectations against a largely unknown primary rival.
In the general election, Menendez will be challenged by Republican Bob Hugin, the former CEO of a pharmaceutical company, who has already spent $7.5 million of his own money on the race, including on ads attacking Menendez on ethical issues.
Alabama, Iowa, Mississippi, Montana, New Jersey, New Mexico and South Dakota all held their own primaries Tuesday — the biggest voting day until the Nov. 6 election.
Rep. Martha Roby, R-Ala., was forced into a GOP runoff with an opponent who has accused her of “(turning) her back on President Trump when he needed her the most.” Roby withdrew her support for Trump after the release of the “Access Hollywood” tape during the 2016 presidential campaign.
She’ll will face former Democratic Rep. Bobby Bright, who lost the seat to Roby, but has switched parties and is now trying to reclaim office as a Trump loyalist.
And in Iowa, Sen. Bernie Sanders, I-Vt., was dealt a blow in the key presidential battleground state when his former state director finished in a distant third place in a Des Moines-area congressional primary. Sanders cut an ad for Pete D’Alessandro and stumped for the Democrat, who also had the backing of the Sanders spinoff group Our Revolution.
In another Iowa district, Democrats nominated Abby Finkenauer, 28, who would be the youngest woman ever elected to Congress if she wins the GOP-held seat in November, when it is considered a top pickup opportunity for her party.
In Montana, Sen. Jon Tester won the Democratic nomination and will face Republican state Auditor Matt Rosendale, who won his party’s backing Tuesday. The will be crucial battleground for control of the Senate this year.