John Sidney McCain III and George Walker Bush both represent the third generation of American dynasties. Both were born into positions of privilege against which they rebelled into mediocrity. Both developed an uncanny social intelligence that allowed them to skate by with a minimum of mental exertion. Both struggled with booze and loutish behavior. At each step, with the aid of their fathers' powerful friends, both failed upward.
In one vital respect, however, the comparison is deeply unfair to the current president: George W. Bush was a much better pilot.