Roy Wilkins, Martin Luther King Jr., and Bayard Rustin, worked out a compromise: The MFDP took two seats; the regular Mississippi delegation was required to pledge to support the party ticket; and no future Democratic convention would accept a delegation chosen by a discriminatory poll. Joseph L. Rauh Jr., the MFDP's lawyer, initially refused this deal, but they eventually took their seats. Many white delegates from Mississippi and Alabama refused to sign any pledge, and left the convention; and many young civil rights workers were offended by any compromise. Johnson biographers Rowland Evans and Robert Novak claim that the MFDP fell under the influence of "black radicals" and rejected their seats. Johnson lost Louisiana, Alabama, Mississippi, Georgia, and South Carolina. Johnson also faced trouble from Robert F. Kennedy, President Kennedy's younger brother and the U.S. Attorney General. Kennedy and Johnson's relationship was troubled from the time Robert Kennedy was a Senate staffer. Then-Majority Leader Johnson surmised that Kennedy's hostility was the direct result of the fact that Johnson frequently recounted a story that embarrassed Kennedy's father, Joseph P. Kennedy, the ambassador to the United Kingdom. According to his recounting, Johnson and President Franklin D. Roosevelt misled the ambassador, upon a return visit to the United States, to believe that Roosevelt wished to meet in Washington for friendly purposes; in fact, Roosevelt planned to — and did — fire the ambassador, due to the ambassador's well publicized views. The Johnson–Kennedy hostility was rendered mutual in the 1960 primaries and the 1960 Democratic National Convention, when Robert Kennedy had tried to prevent Johnson from becoming his brother's running mate, a move that deeply embittered both men. In early 1964, despite his personal animosity for the president, Kennedy had tried to force Johnson to accept him as his running mate. Johnson eliminated this threat by announcing that none of his cabinet members would be considered for second place on the Democratic ticket. Johnson also became concerned that Kennedy might use his scheduled speech at the 1964 Democratic Convention to create a groundswell of emotion among the delegates to make him Johnson's running mate; he prevented this by deliberately scheduling Kennedy's speech on the last day of the convention, after his running mate had already been chosen. Shortly after the 1964 Democratic Convention, Kennedy decided to leave Johnson's cabinet and run for the U.S. Senate in New York; he won the general election in