Democratic Solution To The Filibuster: Make Them Talk

[ProgressiveEconomist]

22. Reference on quorum calls during filibusters: a 2011 CRS paper st senate.gov:

See the section on "Scheduling Filibusters", on PDF page 11 of http://www.senate.gov/CRSReports/crs-publish.cfm?pid='0E%2C*PLW%3D%22P%20%20%0A :

"Filibusters and Cloture in the Senate

...Scheduling filibusters

...late-night or all-night sessions put as much or more of a burden on the proponents of the question being debated than on its opponents.

The Senators participating in the filibuster need only ensure that at least one of their numberalways is present on the floor to speak. The proponents of the question, however, need to ensure that a majority of the Senate is present or at least available to respond to a quorum call or roll call vote.

If, late in the evening or in the middle of the night, a Senator suggests the absence of aquorum and a quorum does not appear, the Senate must adjourn or at least suspend itsproceedings until a quorum is established. This works to the advantage of the filibusteringSenators, so the burden rests on their opponents to ensure that the constitutional quorum requirement always can be met."