What makes you think she was a liberal?
Harry Reid supported her nomination, so she's not a justice I would want. Besides, she wasn't qualified, just a Bush crony.
What she said to the Texas Bar Women's association about Roe v. Wade, and her whole course of conduct while running the White House Counsel's Office, interfering with Ted Olson in both the Michigan Law School affirmative action case debacle and the Texas Sodomy law case defeat. And scads of other misfires. Can you say, Kelo?
From the conservative standpoint she has been given enough rope to evaluate her. She has been a Fifth Columnist. And W took her back to her old job. Where she continues to be a plague on the Conservative house.