Sen. Barbara Boxer is a longtime opponent of judicial nomination filibusters. Or she was. Suddenly the light has dawned, and she realizes how wrong she was to oppose them: "I thought I knew everything. I didn't get it. . . . I am here to say I was totally wrong." Other Democratic senators have had similar changes in belief: Joe Biden and Robert Byrd, Tom Harkin, Ted Kennedy, Joe Lieberman, Pat Leahy, Chuck Schumer and their erstwhile colleagues Lloyd Bentsen, and Tom Daschle have all vigorously opposed the use of the filibuster against judicial nominations. Mr. Schumer was for voting...