The 60 vote Filibuster was really only useful when the Senators HAD TO HOLD THE FLOOR... BY ACTUALLY TAKING THE PODIUM AND SPEAKING TO THE ISSUE...
But about 1970 - Senate Rules were altered so on side could call for a Filibuster and then walk away from the Podium... for no apparent reason etc stop a bill.
The 60 vote Filibuster was really only useful when the Senators HAD TO HOLD THE FLOOR... BY ACTUALLY TAKING THE PODIUM AND SPEAKING TO THE ISSUE...
But about 1970 - Senate Rules were altered so on side could call for a Filibuster and then walk away from the Podium... for no apparent reason etc stop a bill.