It would seem to me that if you have 20 Democrat presidential candidates showing up to the state fair, they would likely attract their supporters or curious Democrats, which should inflate the Democrat numbers. Personally, I think this is a good result for Trump.
2016 was 56/44 for Pres. Trump
2020 51/49 loonies vs. Pres Trump
We have to work very hard to get the President re elected- No one can take it easy