Task: Explanation
Input (English): Carlos Roberto Moreno (born November 4, 1948) is a Mexican-American jurist who is the former United States Ambassador to Belize. Previously, he served as a Judge of the United States District Court for the Central District of California from February 4, 1998, to October 18, 2001, and as an Associate Justice of the Supreme Court of California from October 18, 2001, to February 28, 2011. Following his retirement from the bench in 2011, Moreno was counsel with Irell & Manella. Moreno was considered to be a leading candidate to replace retiring Justice David Souter on the United States Supreme Court. Question: What is the name of the retired Supreme Court Justice that Carlos Moreno was a leading candidate to replace? Answer: David Souter
Output (English):  Moreno was considered to be a leading candidate to replace retiring Justice David Souter on the United States Supreme Court.