As a result of Truman's low standing in the polls, several Democratic party bosses began working to "dump" Truman and nominate a more popular candidate. Among the leaders of this movement were Jacob Arvey, the head of the powerful Cook County (Chicago) Democratic organization; Frank Hague, the boss of New Jersey; James Roosevelt, the eldest son of former President Franklin D. Roosevelt; and liberal Senator Claude Pepper from Florida. The rebels hoped to draft Eisenhower as the Democratic presidential candidate. On July 10, Eisenhower officially refused to be a candidate. There was then an attempt to put forward Supreme Court Justice William O. Douglas, but Douglas also declared that he would not be a presidential candidate. Finally, Senator Pepper declared his intention to challenge Truman for the presidential nomination. His candidacy collapsed when the liberal Americans for Democratic Action and the Congress of Industrial Organizations withheld their support, partly due to concerns over Pepper's attacks on Truman's foreign policy decisions regarding the Soviet Union. As a result of the refusal by most of the dump-Truman delegates to support him, Pepper withdrew his candidacy for the nomination on July 16. Lacking a candidate acceptable to all sides, the leaders of the dump-Truman movement reluctantly agreed to support Truman for the nomination.