Patricia Millett

This photo provided by the U.S. Court of Appeals District of Columbia Circuit shows Judge Patricia Millett in August 2014, in Washington. Millett knows how to fight. The potential Supreme Court nominee earned a second-degree black belt in tae kwon do. But nothing, not her 32 Supreme Court arguments, not her difficult confirmation to become a federal judge and not her 15 years working in government, may prepare her for the showdown set for any nomination President Barack Obama makes to the court to replace Justice Antonin Scalia, who died last month, (U.S. Court of Appeals District of Columbia Circuit via AP)