From the Washington Post:

In an initial chat with Miers, according to several people with knowledge of the exchange, Leahy asked her to name her favorite Supreme Court justices. Miers responded with “Warren” — which led Leahy to ask her whether she meant former Chief Justice Earl Warren, a liberal icon, or former Chief Justice Warren Burger, a conservative who voted for Roe v. Wade . Miers said she meant Warren Burger, the sources said.