Yes.
And they should change it.
That's a matter for the Senate to decide, not you or I. It should be decided with forethought, not spontaneously out of spite because one side or the other didn't get their toy. The 60/40 rule played to DNC advantage through most of the Bush Administration. You even used it to block Appointments, which was unprecedented, I believe, though I may be wrong on that.
Let's be clear on one thing here: *I* didn't do anything. I'm a registered Democrat for business reasons, my politics differ VERY much from the views of the Democratic Party.
I'm much closer to being an anarchist than a Democrat.
And I know that I don't get to decide. Just stating my opinion, nothing more.

You may not believe this, but I have just a tiny bit of Anarchist blood in me too.
Anyway, on the bright side, The Senate came up with that rule on it's own, personally I think it helps limit abuse. Amendment is a 75% bar, thats tough to overcome, a 60% bar isn't so dramatic. Yes good and bad was done with it, yet it makes the dominant force have to try a little bit harder.
Filibuster and Cloture
19th Century Filibuster
Using the filibuster to delay or block legislative action has a long history. The term filibuster -- from a Dutch word meaning "pirate" -- became popular in the 1850s, when it was applied to efforts to hold the Senate floor in order to prevent a vote on a bill.
In the early years of Congress, representatives as well as senators could filibuster. As the House of Representatives grew in numbers, however, revisions to the House rules limited debate. In the smaller Senate, unlimited debate continued on the grounds that any senator should have the right to speak as long as necessary on any issue.
In 1841, when the Democratic minority hoped to block a bank bill promoted by Kentucky Senator Henry Clay, he threatened to change Senate rules to allow the majority to close debate. Missouri Senator Thomas Hart Benton rebuked Clay for trying to stifle the Senate's right to unlimited debate. There is something about the voice of the minority being better supported. If the Senate goes Republican in 2012, you are going to want it.
Three quarters of a century later, in 1917, senators adopted a rule (Rule 22), at the urging of President Woodrow Wilson, that allowed the Senate to end a debate with a two-thirds majority vote, a device known as "cloture." The new Senate rule was first put to the test in 1919, when the Senate invoked cloture to end a filibuster against the Treaty of Versailles. Even with the new cloture rule, filibusters remained an effective means to block legislation, since a two-thirds vote is difficult to obtain. Over the next five decades, the Senate occasionally tried to invoke cloture, but usually failed to gain the necessary two-thirds vote. Filibusters were particularly useful to Southern senators who sought to block civil rights legislation, including anti-lynching legislation, until cloture was invoked after a 57 day filibuster against the Civil Right Act of 1964. In 1975, the Senate reduced the number of votes required for cloture from two-thirds to three-fifths, or 60 of the current one hundred senators.
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