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California’s sorely diminished Republican Party has few footholds left in Los Angeles County, and it risks losing its biggest one in the midterm election on Tuesday: the House seat of Rep. Steve Knight of Palmdale.

Rapidly expanding racial and ethnic diversity on the northern edge of L.A.’s suburban sprawl has opened a path for Knight’s Democratic rival, Katie Hill, to seize this once-solid Republican turf.

The state’s 25th Congressional District — it covers the Antelope Valley, Santa Clarita and Simi Valley — is a lot less white and less Republican than it used to be. The white share of the population has dropped to 40%.

As the campaign draws to a close, President Trump’s stop-the-caravan, troops-to-the-border crusade could further imperil Knight and other Republicans on the ballot in L.A. and Orange counties. For more than two decades, the party’s belligerence on immigration has proved toxic in California.

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