We only have common sense....
We would expect that Kerry and Hubbard exchanged war stories about their service in Vietnman.
My guess is that the "Expert on Vietnam," Kerry, must have sensed Hubbard was lying.
If Kerry didn't sense Hubbard was a quack-serviceman, then Kerry is dumber than we think, and way too dumb to be President.
Imagine "dumber-than-dumb" Kerry's interviews with his cabinet choices.
Kerry:
"There's no need to present your diplomas or job references...I'll take your word that you've worked 3 years as an expert on US relations with Iraq."