The Biden-Trump poll voting period was April 9-July 3, and the Harris polls were July 24-September 15 and September 9-15. So the disparity probably isn't a perceived difference between Biden and Harris as much as the result of things that happened since the Biden poll, like Teamsters president Sean O'Brien speaking at the RNC on July 15
That difference between Biden-Trump and Trump-Harris is crazy though.
The Biden-Trump poll voting period was April 9-July 3, and the Harris polls were July 24-September 15 and September 9-15. So the disparity probably isn't a perceived difference between Biden and Harris as much as the result of things that happened since the Biden poll, like Teamsters president Sean O'Brien speaking at the RNC on July 15