ADA, Mich.—Erin Berkeley Weber served on the student council with Gretchen Whitmer when they attended high school in this Grand Rapids suburb. A Republican who favors low taxes and school choice, Ms. Weber voted for her former classmate’s GOP opponent in the governor’s race four years ago. But Ms. Weber, 51, has known since the Supreme Court overturned Roe v. Wade that she will vote to re-elect the Democratic governor this fall. She said she likes how Ms. Whitmer has fought to preserve access to abortion, including by waging court battles and backing a ballot initiative to codify in state law a woman’s right to end her pregnancy.

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