That advantage did show up in election results. At its peak it gave Obama the largest MOV in an election in PA since Nixon-McGovern. Before hypothesizing about why the change happened, some numbers: Since 2008, 2,127,861 Pennsylvanians changed their party affiliation thusly: D to R: 633,000 I to D : 372,000 R to D : 366,000 I to R: 289,000 D to I: 272,000 R to I: 196,000 Giving Republicans a gain of 360,000. Unsurprisingly these changes have peaks in election years, the biggest being 2016. Both on a total and percentage basis this has happened in southwestern PA more than any other part of the state. A Democratic stronghold for a century, it’s now a super trumpy area. It was the land of steel mills and coal mines and unions. I wouldn’t be surprised if southwestern PA had the biggest electoral shift in the country over the last 30 years. Politically, PA used to be referred to as a T because southeast and southwest were solid blue. Now Allegheny County is an island in the west. I think this is the single biggest factor in that change: You have a bunch of rural communities that never recovered. Plus a lot of latent racism, and FOX news constantly telling them that big city coastal elites are working against them. Add in that anyone smart enough to go to college gets the fuck out. Then here comes Trump promising to put everything back to the way it used to be. When you have dozens of communities that peaked in the 1930s-60s and Trump is telling them in simple words that he can fix it. Which is borne out in the annual data. 2016 was the largest shift of voter registration. 113k D to R in 2016. The rise of MAGA. It’s been declining since then: 81k in 2020, 71k in 2024. As have shifts in other directions as well. Rural PA, lead by SW PA is making the same shift that SE Ohio and West Virginia are/have made. Dying small towns that are looking for someone to blame. Trump gives them someone to blame.