McDowell began his political career in 1965 when he was elected to the Dennis planning board. From 1972 to 1989, he was Dennis town moderator. He appointed the town's first female town meeting tellers and the first woman to serve on the Dennis finance committee. From 1975 to 1979, he represented the 4th Barnstable District in the
Massachusetts House of Representatives. McDowell was chosen by King largely because he opposed a clause in an ethics bill supported by King's primary opponent,
Francis W. Hatch Jr., that would require politicians to disclose all clients they had done more than $1000 worth of business with. Following King's victory at the Republican convention, McDowell was acclaimed as the convention's choice for Lieutenant Governor. McDowell was challenged in the Republican primary by
William I. Cowin, who ran as Hatch's running mate. Cowin defeated Hatch 60% to 40% to become the Republican nominee for lieutenant governor. After leaving the state legislature, McDowell served on the Dennis finance committee for 20 years and the Dennis water district board of commissioners for 15 years. He died at home on July 19, 2024. ==References==