Gallup is all over the place. Here is one from gallup:

https://news.gallup.com/poll/315734/party-preferences-swung-sharply-toward-democrats.aspx

Here is another article from a different source in Pennsylvania:

https://www.ydr.com/story/news/politics/elections/2020/03/05/election-2020-republicans-switching-parties-red-parts-pennsylvania/4901908002/

Arizona has always had more Rs than Ds, with independents being the majority. But this year they are moving to the left and may end up with two Dem Senators and voting for Biden.