Nice big fat FU to John McCain, who seems shocked that democrats would do what he successfully stopped the R's from doing several years ago.
He was right. Removing the historical 2/3rds rule change vote to simple majority vote is going to cause chaos. If the majority can change the rules at-will there is really no point in having rules. Those that think this unprecedented change is going to be limited to judicial and executive nominees are kidding themselves. There are no rules anymore. Each new Congress can create their own rules based on the whims of the party in power.
This ability has always been there, but through all the trials and tribulations this country has gone through nobody has been stupid enough to invoke it.