The vote was 52 to 46, eight shy of the 60 votes needed to invoke cloture and break the impasse.

On October 1, 1968, the Senate failed to invoke cloture.

To overcome that, supporters would need 60 votes to invoke cloture to end debate.

That crucial vote, to invoke cloture, fell short, 53 to 47.

Sixty votes are required to limit debate by invoking cloture.

It takes 60 votes to "invoke cloture," or limit debate.

The filibuster ended when the Senate invoked cloture for only the second time since 1927.

The most effective methods of delay are those that force the majority to invoke cloture multiple times on the same measure.

A motion to cut off debate, or to invoke cloture, requires 60 votes.

To invoke cloture on a change in Senate rules, a two-thirds vote is required.