Doug Mastriano opts out of Senate race.

Pennsylvania State Senator Doug Mastriano has announced that he will not run for the US Senate, opening the way for David McCormick to take on incumbent Senator Bob Casey. Mastriano's decision not to run is expected to be a relief for many Republicans who believe that his loss in the state's gubernatorial contest hurt the party in congressional and state legislature races. McCormick, who narrowly lost the state's GOP Senate primary last year, is expected to launch a second bid later this year, with establishment GOP forces lining up behind him. The Pennsylvania Senate contest is expected to be one of the most expensive on the 2024 map, with the nominee expected to need at least $100 million for the potential brawl.