IIRC weren't there earlier CNN polls that had Biden higher than +5/+4 in FL & AZ? If so, then I hope it's not tightening.
It's obviously going to tighten as the number of undecideds drop, as that's why they were wrong last time. But I'm less concerned this year as there isn't enough room for Trump to make up the difference in most of these even if he gets all of them.
Yeah, these CNN polls are actually the best I have seen for Biden in weeks, because all but the Arizona poll have him over 50. Once he cracks 50, undecideds are irrelevant.
