First, a
chart that I have linked to earlier.There are many threads but they can be untangled by clicking on the tabs. This is pre-debate.
If we click on Registered/likely we can see that
Between Sept 8 and Sept22 Clinton's lead with registered voters has shrunk from 10 points to 0.
Between Sept 8 and Sept22 Clinton's lead with likely voters has shrunk from 5 points to 2.
I have been scanning over some of the supporting data but so far I have not figured out whether the principal ingredient here is that people have changed their preference from Clinton to Trump or whether it comes from previously undecideds now making their choice.
Clicking on the gender tab is interesting. In the 2 week period from Sept8 to 22 the lead with women went from 17 points to 15. A drop, but not a large drop. With men, the change was from a 3 point lead for Clinton to a 16 point lead for Trump. You would have to call that significant.
The debate itself would partially support Cherdano. The Foundation was not mentioned (or so briefly that I missed it) and the emails came and went in a moment.. That's over. But there is still this shift over the two weeks preceding the debate. That shift toward Trump did not occur because voters suddenly heard about the emails, so the withering of that issue will not undo that shift.
If I had to place a bet, I would bet that Clinton's numbers will go up a bit now. But I would not want to bet much on that. To me, Trump looked very bad. But that's not new. He always looks bad to me. Clinton looked sort of good, better than she sometimes does. Is that enough? Beats me. To me, Trump always looks like the guy on a bar stool who knows everything, just ask him, or don't even bother to ask him, he will tell you. It will be loud and it will be incoherent. Talk to Hannity. Talk to Hannity. I don't want to talk to Hannity.
We shall see.
Added remark on numbers: Suppose 100 people are to choose between A and B. Suppose 50 prefer A, 30 prefer B, and 15 have not made up their minds. So A has a 20 point lead. If 10 undecideds now declare for B, the lead is cut by 10 points from 20 to 10. If the undecideds remain undecided and but only 5 switch their preference from A to B, then the lead goes from 20=50-30 to 10= 45-35, also a drop of 10. I apologize if this is obvious to everyone, of course changing someone's mind is a bigger deal than winning over an undecided, but sometimes such things slide by . It would be interesting to know just how this 3 point lead for Clinton among men changed by 19 to an 16 point lead for Trump.I doubt that there were enough undecideds to account for all of it.