[3][4][5][6][7] In 2014, Cook unsuccessfully sought election to the Pennsylvania House of Representatives, losing to Democratic incumbent Peter Daley in the 49th District race.
[13][14] Cook won his reelection in the 2024 Pennsylvania House of Representatives election, defeating Democratic challenger Drew Ross Manko.
[15] Cook's legislative priorities include lower taxes and gun rights.
[16] In 2020, he was among 26 State House Republicans who called for the reversal of Joe Biden's certification as the winner of Pennsylvania's electoral votes in the 2020 United States presidential election, citing false claims of election irregularities.
[17] He also was involved in a multi-year investigation of Local Share Accounts (LSA) and their use in Washington County.