They're "ASSUMING" party identity again, and of course over-sampling whites by an even larger margin this time as you pointed out OP and under-sampling the minority vote by even larger margins as well this time around.
Cross tabs in Florida:
https://www.qu.edu/images/poll...
Cross tabs in Ohio:
https://www.qu.edu/images/poll...
Cross tabs in Pennsylvania:
https://www.qu.edu/images/poll...
Now, this is not to say that there won't be ebbs and flows in polling until November because there will be. This is not to say that we as Dems don't need to GOTV effort and work hard all across this country like we're down 10 points in EVERY state.
However, when you see a once Gold-Standard pollster like Q-Poll who is now trying to make "news" via their BIASED polling, and whose trended to being wrong the past few elections cycles than not well, you know, 
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