George David Aiken
George David Aiken was an American politician and horticulturist. A member of the Republican Party, he was the 64th governor of Vermont before serving in the United States Senate for 34 years, from 1941 to 1975. At the time of his retirement, he was the most senior member of the Senate, and is the most recent Senator to have never served alongside any currently sitting Senators as of 2021. Wikipedia*
On the C-SPAN Networks:
George David Aiken has one video in the C-SPAN Video Library; the first appearance was a 1966 Senate Committee.