No group [white women without a college degree] was more central to Trump’s victory, especially in the Rustbelt states that effectively decided the election. (Trump won at least 56 percent of those women in Ohio, Wisconsin, Michigan, and Pennsylvania, according to exit polls.)...
In the Rustbelt states that decided 2016, Trump has slipped into a much more precarious position with these women: Gallup put his 2017 approval with them at 45 percent in Pennsylvania, 42 percent in Michigan, and 39 percent or less in Minnesota, Iowa, Ohio, and Wisconsin. Compared to his 2016 vote, his 2017 approval among blue-collar white women in the Rustbelt represented some of his largest declines anywhere—
18 percentage points in Ohio and 19 in Wisconsin and Minnesota. That erosion...intensified during Trump’s effort to repeal the Affordable Care Act...
Link to Atlantic article