"Al owned up to the rank question," Kerry told Overend in an article entitled, "Who is Al Hubbard" that appeared in the June 1, 1971 issue of National Review magazine. "He thought it was time to tell the truth, and he did it because he thought it would be best for the organization," Kerry added.
With:
Kerry made a long speech punctuated at frequent intervals bv the demand: "Who is Al Hubbard?" Voicing his opposition to Hubbard's various political and social agendas, Kerry even challenged Hubbard to prove he was a Vietnam veteran.
It looks to me like Kerry even got some of his rhetorical points from the National Review.