Sumner Peter Mills III (born June 3, 1943) is an American lawyer and politician from Maine. A Republican, Mills served in the Maine Senate, representing the 26th district. He ran for Governor of Maine in 2006 and 2010 and lost both times in the Republican primary. He is the older brother of the current Governor of Maine Janet Mills.
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Early life and family
Mills was born in Farmington, Maine, the son of Katherine Louise (Coffin) and Sumner Peter Mills Jr., and grew up in Gorham. He graduated from Gorham High School in 1961. After graduating cum laude from Harvard College in 1965, he served five years on United States Navy destroyers with 3 duty tours in the Vietnam War, for which he was awarded the Navy Achievement Medal. He later conducted intelligence missions against the Soviet Union for which he was awarded the Navy Commendation Medal. Mills graduated second in his class from the University of Maine Law School in 1973.




