To the extent we're able to tell (and we probably can't) it sure looks like the *debate* shift in the polls was very modest but the post-debate Dem and media freak-out shift in the polls may be somewhat larger. Still small enough that all of it could easily dissipate quickly. Or not! At any rate...
Yeah - though I'm not sure the premise is true; the CNN poll is worse than the other ones, but it's also not showing any trend on its own terms; you'd have to assume Biden had gained between the last poll and this one.
