The NYTimes today runs a letter from John Cornyn in response to a Sunday editorial on filibusters. The Texas senator writes:

Now you praise the filibuster as a “time-honored Senate procedure.” In 1995, when Bill Clinton was president, you called it “an archaic rule that frustrates democracy and serves no useful purpose.”
You disparage the Republicans’ view that 51 votes should be enough for judicial confirmation. Yet the 51-vote rule is a consistent Senate tradition. By calling for an end to filibusters, the Senate is simply contemplating restoring its traditions by traditional methods you disparage as “nuclear,” even though they were once endorsed by such leading Democrats as Senators Edward M. Kennedy, Charles E. Schumer and Robert C. Byrd.