Pennsylvania Republican state senator Doug Mastriano announced he will not be running for the U.S. Senate in 2024, instead opting to continue to serve in Harrisburg. His decision has left some wondering who will fill his seat, and how his presence in the state capital will affect the political landscape in the coming years. Mastriano is known for his ties to right-wing extremists and involvement in former President Donald Trump’s attempt to overturn the 2020 election results.