2024 United States Senate election in Pennsylvania

The 2024 United States Senate election in Pennsylvania will be held on November 5, 2024, to elect a member of the United States Senate to represent the state of Pennsylvania. Primary elections took place on April 23, 2024. Incumbent three-term Democratic Senator Bob Casey Jr. announced his intention to run for a fourth term on April 10, 2023.

Background
Pennsylvania is considered to be a purple state at the federal level, especially since in the 2020 presidential election, Joe Biden carried Pennsylvania by about 1.2 percentage points. Democrats currently control both U.S. Senate seats, the Governorship, a majority of its U.S. House congressional delegation, and the Pennsylvania House of Representatives. The last time Republicans won a U.S. Senate seat in Pennsylvania was in 2016.

Senator Bob Casey Jr. was first elected in 2006, defeating then-incumbent senator Rick Santorum by about 17 percentage points. He was re-elected in 2012 by 9 percentage points and in 2018 by 13 percentage points.

The race is considered to be competitive given the state's nearly even partisan lean; however, most polls show Casey to be the slight favorite to win.

Nominee

 * Bob Casey Jr., incumbent U.S. senator (2007–present)

Disqualified

 * William Parker, app developer

Nominee

 * David McCormick, former U.S. Under Secretary of the Treasury for International Affairs (2007–2009), former CEO of Bridgewater Associates (2020–2022), and candidate for U.S. Senate in 2022

Withdrawn

 * Brandi Tomasetti, former Conestoga Township treasurer and secretary (running as a write-in candidate)

Disqualified

 * Joseph Vodvarka, spring manufacturer and perennial candidate

Declined

 * Kathy Barnette, political commentator, nominee for PA's 4th congressional district in 2020, and candidate for U.S. Senate in 2022
 * Stacy Garrity, Pennsylvania State Treasurer (2021–present) (running for re-election)
 * Doug Mastriano, state senator for SD-33 (2019–present) and nominee for Governor of Pennsylvania in 2022 (endorsed McCormick)

Libertarian convention
The Pennsylvania Libertarian Party officially nominated John Thomas at the party's state convention on March 2, 2024.

Nominee

 * John Thomas, educator

Eliminated at convention

 * Erik Gerhardt, carpenter, nominee for U.S. Senate in 2022, and candidate for president in 2020

Polling

 * Bob Casey Jr. vs. Doug Mastriano