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As many times as his constituents want to re-elect him. The longest serving senator Robert Byrd had been elected to the senate 9 times and served 51 years 176 days. Patrick Leahy is presently the longest sitting Senator, elected 7 times and serving over 37 years to date, replacing Daniel Inouye of Hawaii (recently deceased) as the longest sitting senator, who had been elected 9 times and served almost 50 years.

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12y ago

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