Johnson successfully argued the case of a minor charged with prostitution in the 2010 case In re B.W, in which the Texas Supreme Court found that Johnson's client had not committed a crime because she could not legally consent to sex.[4]
In 2020, she was elected to represent District 134 in the Texas House of Representatives, succeeding Republican incumbent Sarah Davis.[5][6] She supports investments in public education, abortion rights, Medicaid expansion, and gun regulation.[7]
During the 2022–2023 session, Johnson was vice-chair of the House Committee on General Investigating, which directed two high-profile investigations that session, first against state representative Bryan Slaton, who resigned and was later expelled from the House on May 9, 2023 for providing alcohol to and having sexual relations with a 19-year old legislative aide,[8] and then against Texas Attorney General Kenneth Paxton, who was impeached by the House on May 27, 2023, on twenty articles involving securities fraud, abuse of office, and retaliation against whistleblowers.[9] Johnson was named one of twelve House members who will serve as managers during Paxton's impeachment trial in the Texas Senate.[10]
Personal life
Johnson is the daughter of former State Representative Jake Johnson and former Judge Carolyn Marks Johnson.[11] Johnson married artist Sonya Cuellar in 2015 after the legalization of same-sex marriage. They have 3 rescue dogs.[3]