I still think Warren is a much weaker candidate than many realize. She has really no appeal outside of her base, and her policy ideas are not something that will play well with those not on the far left. These are the polls you have to pay attention to for the election. Nationwide polls should be ignored because it is unlikely that Trump wins the popular vote in any circumstance.
This election is far from a slam dunk to get Trump out of office.
She is weak, plus she has bad instincts as well. Rolling out a comprehensive Medicare 4 all plan was beyond dumb. She pretty much sunk any momentum she had and is taking shots from both the right and her own party.