Two weeks later, Johnson told a stunned nation that he would not seek a second term. In the weeks that followed, much of the momentum that had been moving the McCarthy campaign forward shifted toward Kennedy. Post-convention Labor Day surveys had Humphrey trailing Nixon by more than 20 percentage points. Nixon made four successful appointments to the Supreme Court while in office, shifting the Court in a more conservative direction following the era of the liberal Warren Court. Rehnquist would later succeed Burger as chief justice in 1986. Nixon appointed a total of 231 federal judges, surpassing the previous record of 193 set by Franklin D. Roosevelt. In addition to his four Supreme Court appointments, Nixon appointed 46 judges to the United States Courts of Appeals, and 181 judges to the United States district courts.