In arranging a unanimous decision in "Brown", Warren fully established himself as the leader of the Court. He also remained a nationally prominent figure. After a 1955 Gallup poll found that a plurality of Republican respondents favored Warren as the successor to Eisenhower, Warren publicly announced that he would not resign from the Court under any circumstance. Eisenhower seriously considered retiring after one term and encouraging Warren to run in the 1956 presidential election but ultimately chose to run after he had received a positive medical report after his heart attack. Despite that brief possibility, a split developed between Eisenhower and Warren, and some writers believe that Eisenhower once remarked that his appointment was "the biggest damn fool mistake I ever made."