Turnout in terms of raw votes cast compared with the 2017 gubernatorial race was up all over Virginia, but some of the places where turnout growth was smallest included Democratic urban areas and college towns.

But Republicans had no such trouble: Their turnout was excellent. In New Jersey, the county that saw the biggest growth in total votes compared with 2017 was Ocean, an exurb on the Jersey Shore, which Gov. Phil Murphy’s Republican challenger, Jack Ciattarelli, won by over 35 points.

Democrats have also struggled in rural areas, and the results last week suggest that they have not hit bottom there yet. In the Ninth Congressional District in rural southwestern Virginia, Mr. Youngkin performed even better than Mr. Trump did in 2020.

This combination — even deeper losses in rural areas paired with fallout in more populous areas — would be catastrophic for Democrats, particularly in the competitive Midwest, where Mr. Biden in 2020 helped arrest Democratic decline in many white, rural areas but where it is not hard to imagine Democratic performance continuing to slide.