“Morse was the only member of the Senate to switch parties and be re-elected. A waterfront arbitrator and member of the National War Labor Board during WWII, he had a knack for strikebreaking. The senator was one of only two senators to vote against the famed Gulf of Tonkin Resolution. His ability to correctly foresee and predict the outcome of the Vietnam War was prophetic and politically valuable.” Source
Senator Ernest Gruening (D-AK) was the other vote against the resolution.