The Center for Politics at the University of Virginia has a reasonably good track record, and their recent poll findings are somewhat shocking. The Daily Mail (U.K.) has the story.
52% of Trump voters at least somewhat agree with the statement: 'The situation is such that I would favor [Blue/Red] states seceding from the union to form their own separate country.' Twenty-five percent of Trump voters strongly agree. Meanwhile, 41% of Biden voters at least somewhat agree with the sentiment, while 18% strongly agree.
We Americans aren't liking members of the other party very much these days either.
Over 75% of voters on both sides agreed with the statement: 'I believe that Americans who strongly support the [OPP_PARTY] have become a clear and present danger to the American way of life.' Seventy-five percent of Biden voters at least somewhat agreed with the statement, as did 78% of Trump voters.
The poll has additional findings you may find interesting, or perhaps frightening.