Presidential Results 2000–2024
| Year | D% | R% | Winner | Margin | Context |
|---|---|---|---|---|---|
| 2000 | 50.6% | 46.4% | Gore | D +4.2 | Philly machine + Rust Belt D coalition |
| 2004 | 50.9% | 48.4% | Kerry | D +2.5 | Kerry held PA despite national R wave |
| 2008 | 54.5% | 44.3% | Obama | D +10.2 | Obama wave; Philadelphia record turnout |
| 2012 | 52.0% | 46.6% | Obama | D +5.4 | Obama wins again; Rust Belt still competitive D |
| 2016 | 47.5% | 48.2% | Trump | R +0.7 | Luzerne +20pt swing; Philly turnout down |
| 2020 | 50.0% | 48.8% | Biden | D +1.2 | Collar Counties flipped; Philly record mail vote |
| 2024 | 48.3% | 50.5% | Trump | R +2.1 | Philly turnout dropped; Rust Belt held R |
Key Senate Races 2018–2024
| Year | Seat | Democrat | Republican | Margin | Winner |
|---|---|---|---|---|---|
| 2018 | Class 1 | Bob Casey Jr. | Lou Barletta | D +13.1 | Casey (D) |
| 2022 | Class 3 | John Fetterman | Mehmet Oz | D +4.9 | Fetterman (D) |
| 2024 | Class 1 | Bob Casey Jr. | Dave McCormick | R +1.4 | McCormick (R) |
Trend Analysis: The T-shaped Divide
Pennsylvania’s politics is defined by a T-shaped geographic divide. Philadelphia and Pittsburgh anchor the Democratic base. The collar counties around Philadelphia (Chester, Delaware, Montgomery, Bucks) have trended sharply toward Democrats since 2016 as college-educated suburban voters moved against Trump. But the interior — Luzerne, Erie, Northampton, and the former steel and coal counties — have swung dramatically toward Republicans.
Key driver: Deindustrialization and cultural conservatism pushed working-class non-college white voters from Democrats to Republicans across 2016–2024. Luzerne County went from Obama+2 in 2012 to Trump+20 in 2016. Meanwhile Bucks and Chester Counties flipped to Democrats for the first time in decades.
Net result: Pennsylvania has been decided by 2 points or fewer in the last four elections, making it the single most important state in presidential politics. The suburban/Rust Belt tradeoff keeps it perpetually on the knife’s edge.
2026 Outlook
Pennsylvania has no Senate majority math in 2026. John Fetterman is up in 2028. The state remains a top presidential target, having voted Republican in 2016 and 2024 and Democratic in 2020. Governor Josh Shapiro (D) remains a highly popular figure and potential future statewide candidate.
The 2026 governor’s race (open seat, Shapiro term-limited) will be a major test of each party’s coalition.