He later became the longest-serving senator in United States history.

He is the longest-serving senator in history to never become his state's senior senator.

He is the longest-serving Senator in the history of Arkansas.

He became the longest-serving senator, remaining in post until his death in 1965.

He then became the longest-serving senator in Delaware history.

At the time of his retirement, Ford was the longest-serving senator in Kentucky history.

He has served for the sixth-longest period among current senators, and is Delaware's longest-serving senator.

The longest-serving senator is Orrin Hatch, in office since 1977.

Carl Hayden, Arizona's longest-serving senator, held the office for 42 years.

He was the longest-serving senator in Connecticut's history.