A number of Republicans running for governor or senator in Wisconsin, Michigan, Ohio and Pennsylvania, including several who hitched their wagon to Trump’s political movement, are behind in polls by double digits, a remarkable turnabout in swing states that were key to the president’s 2016 victory.

If current polling averages hold, Democrats will maintain all their Senate seats in those states, pick up a handful of House seats and, in some cases, retake the governors’ mansions. In nearby Iowa, a state Trump won by nearly 10 points, the Democratic candidate for governor was running about even with the Republican governor in a Des Moines Register/Mediacom Iowa Poll. Polling this week found Gov. Scott Walker (R-Wis.) trailing his Democratic opponent, Tony Evers.

The dramatic shift has forced political strategists to reevaluate their post-mortem lessons from the 2016 election, while raising new questions about Trump’s staying power in 2020. Democratic strategists, who worried that Iowa and Ohio were slipping away from them in presidential years, are now heartened and have begun to return their attention to the traditional bellwethers.