Afterward, Robert Kennedy visited labor leaders who were extremely unhappy with the choice of Johnson and, after seeing the depth of labor opposition to Johnson, Robert ran messages between the hotel suites of his brother and Johnson—apparently trying to undermine the proposed ticket without John Kennedy's authorization.[79]
Caro continues in his analysis that Robert Kennedy tried to get Johnson to agree to be the Democratic Party chairman rather than the vice president. Johnson refused to accept a change in plans unless it came directly from John Kennedy. Despite his brother's interference, John Kennedy was firm that Johnson was who he wanted as running mate; he met with staffers such as Larry O'Brien, his national campaign manager, to say that Johnson was to be vice president. O'Brien recalled later that John Kennedy's words were wholly unexpected, but that after a brief consideration of the electoral vote situation, he thought "it was a stroke of genius".[79] When John and Robert Kennedy next saw their father Joe Kennedy, he told them that signing Johnson as running mate was the smartest thing they had ever done.