August 29: On the second ballot, most of McCarthy’s supporters and many of Humphrey’s supporters bolt to Kennedy’s candidacy. Much of the credit is given to Chicago Mayor Richard Daley, a strong Kennedy supporter who brought in much of the Humphrey vote from fellow big-city mayors. Kennedy wins a narrow-majority.
Hell no, McCarthy supporters hated Kennedy.
Why? Both candidates strongly opposed the Vietnam War.
It wasn't so much the issues than the long drawn out battle between McCarthy and Kennedy. Likewise, Kennedy supporters refused to aid McCarthy after the former's assasination.