What do polls show about civil unrest impact on 2020?

As the support for protests and #BLM has waned, Biden's leads in Wisconsin and Minnesota have shrunk. Harry Enten says Trump 'wants the election to be about crime'

source https://www.cnn.com/videos/tv/2020/08/29/what-do-polls-show-about-civil-unrest-impact-on-2020.cnn