PITTSBURGH — When President Obama comes to Pittsburgh on Thursday to campaign for Vice President Harris in the home stretch for next month’s election, he will be returning to a very different western Pennsylvania from the one he won robustly in 2008 and less so in 2012.

In 2008, Mr. Obama ran on a message of aspiration, using a slogan of hope and change to create a coalition of working-class white people long part of the New Deal Democrats, minorities, young people, and educated professionals.

In that race against Senator McCain, he won 18 of Pennsylvania’s 67 counties. Here in the west, he won Cambria and Erie and came within 100 votes at Fayette, and he earned a whopping 57 percent at Allegheny. Overall, in Pennsylvania, Mr. Obama earned 3,276,363 raw votes, or 54.47 percent, over McCain’s 2,655,885, or 44.15 percent.

By the time he ran in 2012, Mr. Obama’s hope and change were gone, replaced by a more ideological Democratic Party built around climate change, expansive government, internationalism, and a move toward eliminating fossil fuels.

His new coalition of ascendant demographics, minorities, young people, college-educated white elites, and women, was his focus. Left in the dust were New Deal Democrats. It worked, though. Just enough New Deal Democrats stayed with him. However, his slippage in support should have been a warning sign to Democrats that this dismissal of working-class interests might not work for the next Democratic candidate.

When Mr. Obama won Pennsylvania and the presidency in 2012, he did so by being the first president in modern political history to win his second term with fewer voters than in his first run for president.

That was no more evident than here, where the erosion of support was noticeable if you were paying attention. Mr. Obama lost five counties that year, slipping to a narrow 13 of 67. He lost a percentage point here at Allegheny County, lost Cambria, lost Fayette significantly, and counties like Beaver, where the race had been much closer in 2008, all shifted right.

In Pennsylvania in 2012, Mr. Obama earned 2,990,274 votes, or just more than 51 percent, meaning nearly 300,000 people who voted for him before just didn’t show up. Now, the interesting thing about that is those missing voters did not show up for the GOP candidate, Senator Romney, who won just 2,680,434, or 46 percent, of the vote.

In short, Mr. Romney gained just more than 24,000 voters over McCain in Pennsylvania that year, while Mr. Obama lost nearly 300,000 statewide, with many of those voters coming from western Pennsylvania. Mr. Obama lost around 20,000 voters at Allegheny County, a county he won, but the diminishing support at Beaver was around 3,000 votes, Westmoreland 8,000 votes, Fayette 4,000 votes, Cambria 8,000 votes, and Butler around 4,000 votes.

So where did the former Obama voters go if they didn’t go to Mr. Romney? For the most part, it appears they stayed home. They liked the promise of Mr. Obama in 2008 and generally liked him personally, but they did not like his policies, and they saw Mr. Romney not as the guy who brought jobs back but as the guy who came to your desk with a box to escort you out of the building after he politely fired you.

The Obama coalition of the ascendant promised to pay dividends for his party for years to come. For Senator Clinton, that was not the case. She lost a state her husband, President Clinton, won. President Biden, because of his past relationships with unions, was able to glue on just enough of the working-class vote here in 2020 to win the state narrowly.

That working-class vote, white, Black, Hispanic and Asian, is now decidedly in the Republican camp. That party has now become the party of work. A part of the coalition that was always relegated to the sidelines is now in the driver’s seat.

There are scant details out so far for the October 10 visit. It will be interesting to see who comes to the event. The young people who were out blocking traffic in front of the University of Pittsburgh Thursday evening will probably not be there. It is unclear what the energy is for Ms. Harris, or Mr. Biden, among the left’s youth vote.

The suggestion is that Mr. Obama is the strongest surrogate Democrats could draw here four weeks leading up to Election Day. The suggestion eight years ago was that it was Mr. Clinton who would be the best surrogate for Ms. Clinton. Both came, but both were unsuccessful. Working-class voters had a candidate they would actually turn out for in the man of President Trump.

Mr. Obama’s speech at Chicago at the Democratic National Convention this year was not of hope and change. It was mocking and slick, very reminiscent of the Mr. Obama of 2012 who lost support here and across the state.

Case in point: When Mr. Obama was last at Pittsburgh, during the 2022 midterm elections for Senator Fetterman, he said Republicans “make us angry and afraid of one another … so they can take power.”

Of all the campaign stops made by Democrats here at Pittsburgh, including Ms. Harris and her running mate, Governor Walz, the one that will be the most telling in terms of message and who shows up will happen here Thursday.

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