 Complete the following phrase:  After his eldest brothers assassination, both he and Robert were floated as possible presidential candidates, with Lyndon B. Johnson concerned about the Bobby problem. However, the push for another Kennedy candidate was focused on Robert and only a Draft Bobby campaign was launched in 1964 that gained significant traction in the New Hampshire vice presidential primary, but failed elsewhere. In 1968 Robert ran a presidential campaign, against the advice of Ted who urged him to wait until 1972, that vied with Senator Eugene McCarthy in the Democratic primary until his 