As of August 2014, Patrick Leahy is the longest currently serving Senator, having first been elected in 1974. Overall, Robert Byrd was the longest serving Senator, at 51 years.
The longest serving state senator was John Dingell , he served for fifty eight years. He was a democrat from Michigan.
http://www.senate.gov/pagelayout/reference/four_column_table/Longest_Serving_Senators.htm
The longest serving senator is Robert C. Byrd. Served for 51 years in West Virgina.
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The late Senator Mike Mansfield of Montana.
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Thomas Hart Benton
Robert Byrd He was the longest-serving senator and the longest-serving member in thehistory of .... The country needs young men like you in the leadership of thenation. ..... Let us defend the oldest
Barack Obama is a US senator.
Robert C. Byrd is the longest serving U.S. Senator.
Robert C. Byrd served as a U.S. Senator for 51 years. He was the longest-serving U.S. Senator in history.
June 28, 2010
He was 92. Born on November 20, 1917 and died June 28, 2010.
Each state has 2 senators. The one who has been in office the longest is the senior senator.