A Pennsylvania Senate race defied expectations, marking the state's tightest contest in decades.
In short: In a major upset, Republican Dave McCormick unseated three-term incumbent Bob Casey Jr. in the 2024 Pennsylvania Senate election. Despite Casey leading in most polls and being considered the favorite, the race became the closest Senate contest of the entire cycle, forcing a recount and reshaping the state's political landscape.
The 2024 election cycle saw a significant shift in Pennsylvania, a state long regarded as a purple battleground. Bob Casey Jr., who had secured decisive victories in 2006, 2012, and 2018, faced his first general election defeat. His loss was part of a broader trend where three incumbent Democratic senators, all first elected in 2006, lost their seats. The contest was remarkably close, triggering a mandatory statewide recount under Pennsylvania law because the preliminary vote difference fell within a half-percentage point threshold.
The path to victory for McCormick involved navigating a complex electorate. While he benefited from Donald Trump carrying the state, McCormick also sought support from suburban voters uneasy with the former president, campaigning alongside Nikki Haley in areas near Pittsburgh and Philadelphia. Interestingly, both Senate candidates received fewer total votes than their parties' respective presidential nominees. McCormick trailed Trump by approximately 144,000 votes, while Casey finished nearly 39,000 votes behind Kamala Harris. Despite this, McCormick managed to outperform Trump's margins in key suburban counties like Chester, Delaware, and Montgomery.
The final outcome was confirmed on November 21, 2024, when Casey conceded the race and halted the recount process. This election was historic for several reasons: it was the closest Senate race in Pennsylvania since the Seventeenth Amendment was enacted and marked the first time since Indiana in 2012 that a party flipped a Senate seat after losing one in the previous cycle. McCormick, a former CEO of Bridgewater Associates and Under Secretary of the Treasury, was sworn into office on January 3, 2025, creating a unique dynamic where Pennsylvania is represented by a younger senior senator and an older junior senator.
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- Summary by Intellect · source: 2024 United States Senate election in Pennsylvania
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