Christine Porter Marsh is an American politician and public school teacher from Arizona. She was elected to the state senate in 2020, and served until 2025. A Democrat, she was first elected to represent district District 28, and later District 4, after redistricting. She won by 497 votes (50.2%) against incumbent Kate Brophy McGee in an election with more than 120,000 votes cast. Marsh previously ran against Brophy McGee in 2018 and lost by 267 votes (49.9%).