poor consumer of information...yeah...but...

what he does hear/read, isn't digested correctly

seriously evident in his debate tale of w.v. postman selling ballots...(and other poorly processed stories)...in fact, was a post office contractor, 'for a joke', changed voter political affiliation (D to R) on ballot request forms

details are important

perhaps that's the crux of why don can't tell the truth
he has no clue to what is and isn't as his head acts like an ass w/i.b.s.

can't hold on long enough to firm up the details (subject matter)
and it leaves his mouth (the northern one) unable to hold together

but, whole another reason likely
don't really need to to know squat
that log is sliding down the flume soon