The most interesting part about this poll is actually the nosedive Sanders has taken among younger voters:
https://morningconsult.com/form/youth-support-2020/Not looking good for him at all.
If today’s polling is any indication Biden received an announcement bump of sorts. This should not be that much of a surprise considering all the other candidates received one as well. It may be starting to fade now.
A 1% drop indicates nothing of the sort. It indicates nothing at all, because it is statistically meaningless. If anything, it actually suggests that Biden's bump may be here to stay, unlike the other candidates who received a bump that faded rather quickly. Joe's been running three weeks now, and still no change in his dominant standing in the polls. Not even the slightest hint of decline, and again 1% does not count.