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Current US Senators likely to be the longest serving US Senator in US History.
Longest serving former US Senator
Longest serving current US Senator
Leahy(D-VT)elected in 1974- seeks re-election in 2022 and retires in 2028. 54 years
Hatch(R-UT)elected in 1976- gets re-elected in 2018 and retires in 2024. 48 years