When Taft died on July 31, 1953, Knowland was chosen to succeed him as Senate Republican Leader (majority leader from 1953 to 1955, minority leader from 1955 to 1959). At age 44, he is the youngest senator to occupy the position of majority leader. The Republican majority during Knowland's stint as majority leader was tenuous. Taft's Senate seat was filled by a Democrat, which gave Democrats 48 seats compared to the Republicans' 47. One Senator, Wayne Morse of Oregon, who dropped his Republican affiliation to become an independent, pledged to vote with the Republicans on organizing the Senate in 1954 and brought the Republican tally to 48 seats. The constitutional provision for the Vice President to cast a tie-breaking vote gave Republicans a working majority to organize the Senate.