For the first time in more than a decade, Idaho has an opening for a new governor, thanks to the retirement of the three-term incumbent, C.L. Otter, known as Butch. In a state that Donald J. Trump won by more than 30 percentage points and has not elected a Democratic governor since 1990, the Republican primary is almost certainly where Mr. Otter’s successor will be chosen.

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The main candidates were Lt. Gov. Brad Little, Representative Raúl R. Labrador and Tommy Ahlquist, a doctor and developer. Mr. Little, a rancher and former state senator, had Mr. Otter’s endorsement, but Mr. Labrador, a co-founder of the conservative House Freedom Caucus, challenged him from the right.

Mr. Ahlquist has no political experience — something he cast as a positive, à la Mr. Trump, arguing that he can bring much-needed business acumen to the government.

In such a red state, the Republican nominee should have no trouble defeating former State Representative Paulette Jordan, the Democratic nominee, in November.