From Robert Byrd's appearance on Booknotes in 1989:

"[Senator Mansfield had] kind of a laid back style. I served under both Mr. Johnson when he was Majority Leader and Mr. Mansfield. Mr. Johnson -- the hard driving type. The type who would twist arms, cajole, threaten, plead and drive. Mr. Mansfield was just the opposite. He believed in letting every Senator go his own way, make up his own mind. He didn't attempt to twist arms. I did the floor work. Mr. Mansfield was back in his office reading the press, papers, and books and so on. So they had their different styles. Both were good leaders."

Funny how Byrd ducks the question of what he thought about Joseph McCarthy.