BUT THEN, in 1975, the rules changed, in a way that eventually gave us our current filibuster-everything-without-really-filibustering environment. A reader takes up the story from here:
Many of your readers may not know what you and I and [a reporter I quoted] no doubt do, to wit, that until 1975 cloture required a 2/3 vote and that that was changed then to the current 3/5 (except in a vote on Senate rules which still needs 2/3). Even more interesting, however, is that the 2/3 was 'of Senators present and voting' and the 3/5 is 'of Senators sworn'. That, of course, is why it used to be that a filibuster could be continued only while the filibusterers kept their forces on the floor in sufficient numbers to constitute a third of all present, while since 1975 a Senator at home in bed is a vote to continue the filibuster. That changed everything and there is no more strategy involved, i.e., you have 60 votes or you don't and persuading an opponent to abstain or absent himself for an hour is without effect.
Dennis Hutchinson, a longtime friend who teaches constitutional law at the University of Chicago law school, adds:
Of course the problem is that the Senate mis-used its powers under Art. I, §5, cl., 2 to "determine the rules of its proceedings" when Mike Mansfield allowed tracking such that two items of legislation could be on the floor at the same time and one could be filibustered without stopping the entire proceedings. And since a two-thirds votes is necessary, under Senate rules, to change Senate rules, this problem will be around for awhile.
Note for the young: Mike Mansfield (right), a Democrat of Montana, was the Senate's majority leader at the time. In the post-Watergate mood of cleaning up Washington and reforming the government's baroque ways, the change in "Rule 22," which governed the filibuster, was thought to be progressive. After all, 60 Senators, rather than 67, seemed a more reasonable threshold for breaking a filibuster; and the "two-track" system meant that the Senate's business wouldn't grind entirely to a halt just because one issue couldn't be resolved. The rules haven't changed since 1975, despite several short-lived feints -- but the norms have changed in the past few years, so that the 60-vote filibuster threat is applied to practically any proposal or nomination of significance. Even nominees who are eventually approved by the Senate by 90-10 or 85-15 margins are often filibustered, just to slow things down.
You can read more about the consequences of this 1975 reform from Thomas Geoghegan (for the record, also a longtime friend). And no doubt you'll have further chances in this space! For now this last thought, from a reader with family ties to George Norris, the long-time "progressive Republican" U.S. Senator from Nebraska:
[My ancestor] Senator Norris filibustered the old fashioned way, as it were. (His stand that no politician should invest in any asset except US bonds to avoid any bias also contrasts sharply with politicians today.) I did want to point out that, if the Democrats lose the Senate, then I predict that the Republicans will simply change the rules*, thus eliminating the problem. At that point they will cheerfully switch sides, and then ram it down the throat of the Dems. My favorite line of Krugman's is that the Republicans "are serious men", by which he meant that they played a tougher, and longer, game than their opponents.
* To clarify, changing rules during a session requires a 2/3 vote, but it is generally understood that every two years, at the start of each new Congress, each House can set rules for itself by majority vote.