Yeah, that's probably part of it. But from what I've heard the speech was too competent to be the result of extensive editing as it was visibly quite fluent.
But Biden has (Vascular) Dementia, and every reputable pundit now agrees that this is an irrefutable fact. And they're right, he typically displays conspicuous symptoms of dementia.
With dementia you don't have "good days" and "bad days". So if Biden delivered an intelligent, coherent speech it wasn't because his dementia symptoms had somehow magically improved on the night.
Now, this acceptance speech was something Biden HAD to make and it HAD to be good - if he delivered a series of gaffes or verbal screw-ups or lapses in concentration, etc, it would do tremendous damage to the Democrats' election prospects. Thus, they would have been desperate to prevent this, and would have resorted to any available means to prevent it however unethical.
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So I think what happened is that Biden was given a substantial dose of a stimulant, amphetamine-type, drug like "Aderral" or "Dexedrine" before he made his speech. These drugs are called psychostimulants by doctors and they DO have the ability to (temporarily) boost cognitive performance in the case of relatively early stage dementia. I say "relatively" because I think Biden's dementia is degenerating quite rapidly now. Kids call these drugs "Speed" - you may have heard of "Meth" or "Crystal Meth", that's basically the same class of drug I'm sure Biden was using. They have the effect of "waking up" a sleepy,, dementia brain BIG TIME - kind of like a SUPER- SUPER-DOOPER dose of Coffee (caffeine)
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What I'm sure happened is that the DNC paid a private physician to write Biden (or a proxy) a prescription for some Dexedrine, Methedrine or Aderral, etc to take before his speech. There is NO OTHER POSSIBLE explanation for the fact that he apparently spoke lucidly and at some length on the night in question.
Dachshund