Robert McCarthy holds a Bachelor of Science degree from the United States Military Academy and a Bachelor of Laws degree from Boston College Law School. He served in the United States Army as an Infantry officer, including assignments with the 82nd Airborne Division. McCarthy practiced law in East Bridgewater, Massachusetts, before entering public service as a member of the East Bridgewater Board of Selectmen and the Massachusetts House of Representatives. He later served in the Massachusetts Senate and ran for the U.S. House of Representatives. McCarthy also served as the Register of Probate for Plymouth County, Massachusetts.

Robert McCarthy's political career reveals a strategic thinker who often aligns with unexpected factions, suggesting a calculated approach to policymaking. His military background and local political experience hint at a unique blend of disciplined rigor and community-focused governance. McCarthy's tenure in various roles indicates a penchant for navigating complex political landscapes, balancing regional interests with broader policy objectives. His rhetorical style likely emphasizes pragmatism in action rather than ideological purity, appealing to a broad electorate through targeted, results-driven arguments.