Could "Present and Voting" Help Reform the Filibuster?

Senate reformers have been talking lately about new filibuster rules that would require minority senators to keep talking during the entire length of their filibuster. No more nonsense about just announcing a filibuster and then heading out for drinks. Gregory Koger points out a problem with this: A determined majority could outlast a single obstructionist, or a few senators, but an organized succession of twenty or so senators could occupy the floor one at a time, each demanding the presence of...