Okay, we now have a roster of four major post-debate national polls in and here's the average of them:
Biden: 31%
Sanders: 15.8%
Warren: 15.5%
Harris: 8.3%
Buttigieg: 5.5%
Others: 2.5% or less
The bottom line here is that Kamala Harris's poll numbers have now largely reverted back to where they were before the first Democratic debate (she was averaging 7% then) and Biden has regained essentially all ground he lost to her in that debate as a result. It's impossible to tell whether the second debate round had any affect that on that trend because it was already ongoing anyway. Regardless, it's looking like she was just a passing fad at this point.
It also appears that Elizabeth Warren may have benefited from the debate at the margins, catching back up to Bernie Sanders as a result, having been averaging about 2.5 percentage points behind him just before. This is her best polling average to date. Still, she didn't catch up.
That's the only "movement" here. Biden is leading by a margin of 15.2 percentage points, which is almost equivalent to his nearest rival's entire base of support. This contest is clearly set in stone.
