I'm sorry but this is not fair and balanced and, therefore, the ultra-left wing neocommunist media will not touch it. The NYT, IIRC, maintained absolute secrecy on all classified and secret matters regarding Nam and would be unable to comment on whether traitor John had ever been in Cambodia.
You miss the point - you don't need to prove whether Kerry was there, all you need to do is prove (a) Nixon was not President in 1968 (DUH) and (b) Kerry spoke on the floor of the Senate as he did fighting Reagan in the 1980's and providing the details of his "story" (thus disproving itself)