To replace Justice Stephen Breyer on the nation's high court, we need a new justice who is a coalition-builder and a neutral arbiter, not another partisan warrior. The court and the nation would most benefit from a justice who will seek consensus on a court that struggles to reach unanimity in half its decisions. One short-list candidate has already proved that she has these qualities: California Supreme Court Justice Leondra Kruger should be the next U.S. Supreme Court justice.