On December 17,2012, following the death of Hawaii Senator Daniel Inouye, Leahy became the most senior Democratic U.S. Senator and was elected to the post of President pro tempore of the United States Senate.
Leahy became the most senior Democratic U.S. Senator pro tempore of the United States Senate. This was following the death of Hawaii Senator Daniel Inouye. This was on December 17,2012. Leahy was elected to the post of President pro tempore of the United States Senate. This was following the death of Hawaii Senator Daniel Inouye. This was on December 17,2012.