How you gonna get 60 votes whether they are present or not? It takes 60 not 60% of those present.
Not correct. Cloture is based on the number of members actually present. Say they get a filibuster going and a few senators leave town for the weekend. Snow storm, quorum call, and 75 Senators are present. The cloture vote would require 45 affirmative votes (3/5ths).
I have have to correct myself upon further reflection. Rule 22 contains language about 3/5ths of those duly sworn, taking into account "vacancies." Whereas, all other voting thresholds apply to the members present, it may be than in Riddick (the Senate Rule Book) that cloture is given an absolute number. There is also a thirty hour rule about showing up or continued debate.
I'll need to do a little more research in Riddick back at the office. Until then, I stand corrected.
So I'll throw this into the blend: If, at a quorum call, the Republicans can obtain a 2/3rds majority of members present they can amend the rules!