Democrats believe Gov. Kim Reynolds, a Republican who took office last year to fill the remainder of Terry Branstad’s term, may be vulnerable. Fred Hubbell won the nomination to challenge Ms. Reynolds in November.

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Two of Iowa’s four congressional districts, both currently held by Republicans, are also expected to be competitive in November. In the First District, which includes Cedar Rapids, Dubuque and Waterloo, Representative Rod Blum — a Trump-supporting Tea Party Republican and member of the conservative House Freedom Caucus — could be vulnerable to a challange from State Representative Abby Finkenauer, who won the Democratic nomination.

And in the Third District, which includes Des Moines, small-business owner Cindy Axne will challenge Representative David Young.