As recently as March 2000, several Republicans voted to filibuster two Californians whom President Clinton had named to the 9th Circuit appellate court: Richard A. Paez and Marsha L. Berzon. Paez had to wait more than four years for a final vote, a record delay. Ultimately, the Republican stalling tactics failed, and both jurists now sit on the appellate court. 
In 2000, Cloture votes were necessary to obtain floor votes (up-or-down) on Clinton judicial nominees Richard A. Paez. Hmmmm, who could that have been trying to filibuster the nomination? Who, oh who? Well, look-see there, it was several Republican senators, including current Majority Leader Bill Frist (R-TN), who voted against cloture. 
Voted against cloture Mr. Frist? An attepmted filibuster Mr. Frist? No up-or-down vote Mr. Frist?... that's just down right unconstitutional of you, ain't it?
1 - Republicans force filibuster all-nighter
2 - MMA