The 1975 Compromise That Built the 60-Vote Senate

On February 26, 1975, the Senate voted 51-42 to table a point of order from Majority Leader Mike Mansfield. It established that a bare majority, at the start of a new Congress, could rewrite Rule XXII without facing the two-thirds cloture threshold the rule itself required to amend. The nuclear option, decades before the term entered common use, had just been detonated.

The reformers were Walter Mondale of Minnesota and James Pearson of Kansas. Their Senate Resolution 4 would have lowered the cloture bar from two-thirds of senators present and voting — the standard set in 1917 after Wilson's "little group of willful men" speech — to three-fifths of those present. On a sleepy day that could mean as few as 54 votes.

Then Senator James Allen of Alabama, a procedural savant, started filibustering Pearson's motion itself, contesting it in pieces. Vice President Nelson Rockefeller, presiding, began cutting Allen off and putting questions to votes faster than senators could object. Russell Long shouted that Rockefeller was running "one man cloture" from the chair. The reformers had the votes. They were losing the room.

Mansfield pulled Robert Byrd in to negotiate. The deal: cloture would drop, but to three-fifths of "senators duly chosen and sworn" — sixty out of one hundred, no matter how many showed up. In exchange, the Senate would formally reverse the precedent it had just set.

The compromise passed on March 7, 1975. Reformers got a lower number. Institutionalists got the precedent buried. What no one quite saw was that pegging cloture to the full membership rather than the senators present would, as the chamber polarized, turn 60 into a hard floor on almost every contested bill. Today's Senate, where 60 votes is the price of doing business, is the long shadow of a deal meant to cut the filibuster down to size.