The poll was completed after the news broke that President Trump and his wife Melania have been infected by Covid-19.
But 68 percent said the illness would not affect their vote while 19 percent said they were “more likely” to support Trump and only 13 percent “less likely”.
Almost two thirds said they felt sympathy and concern for the President while 38 percent said him getting the disease was “karma” in an indication of the current divisive nature of US politics.
Crucially, Mr Trump’s lead in key swing states including Florida, Iowa, Michigan, Minnesota, Pennsylvania and Wisconsin remains at 4 percent by 47 percent 43 percent.
This gives a projected Electoral College split of 320 to Trump and 218 to Biden.
While other polls have Biden ahead, the Democracy Institute, which correctly predicted Brexit and Trump’s win in 2016, only considers people who identify as “likely voters” rather than all registered voters and also asks about the so called shy vote.