Anytime there are such large numbers of "undecideds" it's likely they are low-information, and an opportunity for Trump (or any unscrupulous politician, but really, Trump) to lie to them and turn them to whatever side they wish.
Since 170M Americans look at TT, I wonder of how much of it was TT propaganda itself.
The amount of propaganda on TT is rather huge, though I won't say any different than US media, just more of it these days oriented to how 'good' China is.