Leahy held the position of president pro tempore of the United States Senate from December 17, 2012 to January 3, 2015, and was thus during that time third in the presidential line of succession
Now in his eighth six-year term of office, he is currently (since the December 2012 death of Daniel Inouye) the most senior member of the Senate, and is also the last of the Senate's "Watergate Babies" – Democrats first elected to Congress in 1974, following President Richard Nixon's August 9, 1974 resignation over the Watergate scandal
Additionally, Leahy remains the only sitting U.S. Senator to have served during the presidency of Gerald Ford
Leahy received the title of President pro tempore emeritus in January 2015
He is the longest-serving Democrat in the current 116th Congress
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