It has been expressed that as many as 15% of Republicans would vote for Biden. I've been going over the numbers. Which I would say that was completely wrong. Right now 91% of Republicans plan on voting for Trump, 4% for Biden. Question 60.

https://docs.cdn.yougov.com/k05rp8ded6/econTabReport.pdf

Back in 2016 88% of Republicans voted for Trump, 8% for Hillary.

https://www.cnn.com/election/2016/results/exit-polls

That's pretty far away from the expressed 15%. So it was on to party affiliation. Back in November 2016 Republicans made up 27% of the electorate, Democrats 32%, Independents 37%. Today the figures are Republicans 25%, Democrats 32%, independents 40%.

So what I see happening is the anti-Trump Republicans have moved over into the independent column, they'd didn't become Democrats. That could explain the rise from 88% to 91%, the drop in party affiliation. Some Republican anti-Trumpers becoming independents, the pro-Trumpers remaining Republican.

It'll take a bit more research, but taking the numbers at face value, this seems to be the case.
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It's high past time that we start electing Americans to congress and the presidency who put America first instead of their political party. For way too long we have been electing Republicans and Democrats who happen to be Americans instead of Americans who happen to be Republicans and Democrats.