Emerson College has made a survey of registered voters in Iowa. They looked at the forthcoming Presidential election. First they asked about a two-candidate race between Biden and Trump. Then they asked about a third-party race between Biden, Trump, and Cornel West.
In 2020 the actual voting results were Trump 53%, Biden 45%, Jorgensen 1%, and Others 1%.
In 2023, the poll on a two-way Trump-Biden race was Trump 50%, Biden 39%, meaning 11% did not choose to support either of these two men.
In 2023, the poll to the same group of voters on a three-way Trump-Biden-West race was Trump 48%, Biden 35%, West 5%. Comparing with the two-way race, Trump lost 2%, Biden lost 4%, West was up 3% over all 2020 third-party voters combined, and the count of those who did not choose and of these candidates went up 1%.


Correction, it was another figure (Nobel Prize winner) who blamed Libertarians for COVID, though Reich is pretty out there about Libertarians.
Reich, who once blamed Libertarians for COVID, is at it again with his attacks on smaller parties–while carefully refraining from mentioning the Libertarian Party–and now claims the Green Party are a front for Trump. https://www.theguardian.com/commentisfree/2023/sep/11/robert-reich-third-party-candidates-will-help-trump-win
2020: Biden 51.30%, Trump 46.85%, Jorgensen 1.18%, all others 0.67%.