No, it was obviously a majority of the Whole Senate that was obviously necessary-----51 votes.. This needs to get out.
This site concurs.
"In 1975, Walter Mondale (Democrat-Minnesota) and James Pearson (Republican-Kansas) led the fight for a three-fifth's cloture rule using the "Constitutional option," meaning that they believed that debate over the Mondale-Pearson proposal could be brought to an end by a simple majority vote. Other Senators believed that debate over this cloture rule proposal could only be brought to an end by satisfying the cloture rule in effect from previous Senates: by winning the support of two-thirds of the Senate.
Senator Javits moved to "table" [defeat] Senator Mike Mansfield's point of order against the Mondale-Pearson cloture proposal because it was "self-executing" by demanding an immediate vote without satisfying the two-thirds cloture rule. Vice President Nelson Rockefeller, acting as presiding officer of the Senate, issued a ruling that if a majority of the Senate voted for Senator Javits's "tabling motion," the Senate could proceed immediately to a vote on the Mondale-Pearson cloture rule proposal. The Senate upheld the Mondale-Pearson "Constitutional option" on three separate occasions during the period from February 1975 through March 1975. After more parliamentary maneuvering, the Senate enacted the three-fifths cloture rule by a vote of 56 to 27 on March 7, 1975."