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VISALIA, Calif. — Amid neat rows of orchards, on cattle ranches and dairy farms across the southern territory of California’s San Joaquin Valley, the churn of daily life offers few hints of an imminent political spectacle. This is another California, where conservative values are often taken for granted, and where the tide of liberal “resistance” runs as dry as its unirrigated dirt.

Consider Representative Devin Nunes, in the state’s 22nd Congressional District. He has become a lightning rod on the left over his animated defense of President Trump in the investigation into Russian meddling during the 2016 election. Yet as national Democrats spend millions of dollars trying to seize Republican seats in California in the midterms, noisy advertising and political commotion ahead of the June 5 primary appear to have scarcely penetrated the minds of voters in this part of the state.

In 2016, the 22nd District overwhelmingly went for Mr. Trump, and voters are quick to write off criticism of Mr. Nunes, whose family farming background many closely relate to, as television spin and partisan bickering.

On a sunny day on Visalia’s quiet main street, Will Dixon, 41, said he believes Mr. Nunes has “done a lot for the valley” and its farmers. Mr. Dixon, who has lived in the area his entire life, said that he heard some grumbling on television about Mr. Nunes becoming a character in the Russia investigation, but said he feels that the congressman has shown he is committed to his constituents.