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Dean of the United States Senate

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The Dean of the United States Senate is the Senator that has been in office the longest.

Unlike the office of President pro tem, the Office of Dean is not an official position.


After the death of Daniel Inouye on December 17, 2012, Patrick Leahy became the new Dean of the Senate. Also since the death of Inouye, Leahy became the President pro tempore and "dean".[1] Leahy is the senorist Democratic Senate politician in the United States.


  1. Cillizza, Chris. "Hawaii Sen. Daniel Inouye dies at age 88," Washington Post. December 17, 2012; retrieved 2012-12-17.