Ass-covering, pure and simple.
In all the polling compiled by Real Clear Politics, Bernie has polled in the lead only one other time, in April 2019 in a tiny Emerson poll, where he was +5.
Previously CNN polling has shown Joe Biden consistently and decisively leading, by an average of +12.6 across eleven polls.
CNN polls have also been consistently tiny surveys of registered voters, not likely voters. A very large likely voter poll recently by Morning Consult shows Biden ahead nationally for the Democrat nomination by +5.
