Jarman was reelected 11 times without serious difficulty, even as the Oklahoma City area trended increasingly Republican at the local level. Although the district had supported a Democrat for president only once since Harry Truman, most local offices were still held by Democrats. By the 1970s, however, Republicans began making gains at the local level. For example, in 1974, Jarman was nearly defeated by a Republican newcomer, Mickey Edwards, despite Republicans being severely punished that year for the Watergate scandal.
On January 24, 1975, Jarman switched parties and became a Republican in protest of the removals of F. Edward Hébert, Wright Patman, and William R. Poage from their committee chairmanships.[7] Jarman claimed that the House Democratic Caucus had changed over the years and had elements that "force their liberal views on this Congress and on this country by nullifying the seniority system and punishing those who do not adhere to the liberal party line as laid down by the caucus."[7]
He did not run for re-election in 1976. Edwards won the seat, and the district remained in Republican hands until Kendra Horn unseated Steve Russell in the 2018 midterm elections approximately 42 years later.
Retirement and death
Jarman declined to seek re-election to the House in 1976.[8] After leaving Congress, he decided to resume his practice of law in Oklahoma City, until he died there on January 15, 1982.[9]
