During World War II he served as a lieutenant commander in the Caribbean.
[1] Lynch supported John F. Kennedy during his first run for the United States House of Representatives.
In 1956, at Kennedy's request, Lynch ran for and was elected to the position of state party chairman.
[3] As chairman, Lynch laid much of the groundwork for Kennedy's 1960 presidential campaign in Massachusetts and traveled with him throughout most of the primary states.
He was later offered the position of customs collector for all of New England by President Lyndon B. Johnson but declined and instead chose to retire.