He has work to do. According to national polls from YouGov/The Economist, the former president is polling nationally at 43% among white suburban voters with a college degree. That is three points less than the share he won in 2020, according to Catalist, a progressive political-data firm. How, then, did Mr Trump build a steady lead over Mr Biden this summer? Among educated white suburbanites, at least, it is not so much that Mr Trump is winning; it is that Mr Biden was losing, and the question now is whether a new Democratic nominee can reverse that trend. In 2020 the president won 53% of white, college-educated suburban voters nationally. Across June and July 2024 Mr Biden polled at 43%.

Michigan, suburban counties*, 2023

Share of total votes cast by

suburban voters†, 2020, %

*50% or more of the population live in a suburban zipcode
†Defined by Catalist

Sources: Catalist; Jed Kolko; The Economist

Michigan, suburban counties*, 2023

Share of total votes cast by suburban voters†, 2020, %

*50% or more of the population live in a suburban zipcode
†Defined by Catalist

Sources: Catalist; Jed Kolko; The Economist

Michigan, suburban counties*, 2023

Share of total votes cast by suburban voters†,

2020, %

*50% or more of the population live in a suburban zipcode

†Defined by Catalist

Sources: Catalist; Jed Kolko; The Economist

This summer, particularly after Mr Biden’s cataclysmic debate performance on June 27th and until he ended his campaign on July 21st, Mr Trump has maintained a steady lead in national polls and in every swing state. Yet as the ceiling on his vote-share shows, Mr Trump remains vulnerable in the suburbs. A Democratic comeback would probably pass through swing-state suburban counties like Oakland.

Rochester Hills may appear as if it belongs in a 1960s John Updike novel, but the suburbs are not what they used to be, politically or demographically. For one, they are more racially diverse. Since 1980, the number of white residents in Oakland County has held steady but the number of non-whites has grown from 60,000 to 320,000 in 2020. The county has shifted left during this period; greater diversity is probably one factor, along with changing views among college-educated white voters.

Polarisation along educational lines has also changed how suburbanites vote, just as it has in cities and the countryside. Consider Michigan’s tale of two suburban bellwether counties. Between 1972 and 2012, Oakland, where half of adults have college degrees, and its working-class neighbour, Macomb County, where a quarter have degrees, were regarded as lockstep predictors of Michigan’s vote in presidential elections.

Oakland voted for the candidate that won the state ten out of 11 times, while Macomb did so nine times. The average difference in candidate margins across the two counties was just four points. But Mr Trump changed all that. In 2016, Oakland and Macomb diverged by 20 points and Mr Trump won Macomb with 54% of the vote. (Hillary Clinton prevailed in Oakland.)

Since that election, Republicans have found themselves on shaky ground in Michigan. Their once-strong state party fell into disarray, riven by internecine struggles and swamped with debt. And Republicans would surely prefer to forget about the past three elections in the state. In 2018, the first midterm election after Mr Trump took office, Republicans “got slaughtered in Michigan”, says Jason Cabel Roe, a veteran party strategist in the state. Ms Whitmer won the governor’s race, and Democrat women won races for attorney-general and secretary of state. Two more women Democrats, Haley Stevens and Elissa Slotkin, won competitive congressional races, marking the first time since the 1930s that Oakland County had no Republican representatives in the House. “It was very much the year of the woman,” Mr Roe adds.

Michigan, vote margin relative to state average*,

percentage points

Sources: Catalist; Michigan Department of State

It got worse for Republicans in 2022. As Ms Whitmer won her second term easily, a ballot initiative to enshrine abortion in the state’s constitution passed by 13 points. Democrats took control of the state House and Senate, and established their first trifecta in 38 years, controlling the governorship and both chambers of the legislature.

With abortion rights in the state already established, that issue—a probable rallying point for Ms Harris’s campaign—has less salience in Michigan. Suburbanites are most concerned about the economy this time around, according to polling from Emerson College. Generally, Mr Trump polled better than Mr Biden on that issue. Yet so far, there has been little enthusiasm for this election. In the summer of 2020 polling from YouGov/The Economist showed that some 70% of white, college-educated suburban voters were extremely or very enthusiastic about that year’s election. Across June 2024 only about half said the same. In an initial poll after Mr Biden left the race, enthusiasm among Democrats rose to 54%, compared with 43% in a previous poll.

Ms Hawkins’s pitch in Rochester Hills for a kinder, gentler form of Trumpism reflects recent attempts by the national Republican Party to consolidate and extend its candidate’s lead by toning down MAGA pugilism and welcoming never-Trumpers back into the fold. The effort was on display at the party convention in Milwaukee. It is not a natural script for Mr Trump and he did not stick to it for long, but some of his allies on the front lines understand what it takes to win in blue-leaning areas. “The formula is to trim yourself a little bit on the rhetoric and the issues that you talk about,” Mr Roe says. The “guiding principle is to give non-Republicans permission to vote for a Republican.” Even one carrying the baggage of Donald Trump.■