I have a feeling as we see the genuine Leftist of the party migrate over to the Green Party, the party membership in terms of numbers will be decreased, but the question will by how much and how many more Conservatives migrate over to the Democratic party in this election augmenting those losses. I've seen GP pr spinning increases by "1000 % points in a day". but what does that actually mean in terms of numbers? I haven't done that research and it's too fluid at this point, and changing by the day.
As for me, I'm not quite there.
I only mention this because I have been interested in understanding just how "left" is (or was) the party in terms of registered voters political identity or inclinations. it's always been impossible for me to determine by virtue of "elected" officials of the party. Too few (if any) are actual Leftists.
The only measure which might remotely come close to accounting for that quantifier are by the numbers of reps who comprise the Progressive Caucus. As we've seen that's not necessarily a true account either, when some of those members vote for Neoliberal legislation time and time again.
The dynamics of this election and the sharp delineations have the potential of being clarified, perhaps. But I believe the Fear Factor card may once again throw fog on that analysis yet again, as it alway has in the past. Right now I'm seeing left journals time after time bring up the political dynamics in Germany pre WWII. The FEAR FACTOR is in full operation. So it's likely we will continue to pursue the answer to this question for another generation or two.
Random thoughts... hope you find this relevant. 
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