America has two sets of values, urban and rural. I just finished a 3 hour drive between Indiana and Ohio and you will go 30 minutes seeing only trump signs in rural yards then see it slowly swap to Biden and blm when you get into more dense areas then slowly phase back into trump signs as you get back into rural towns and farmland. Very rarely do you see two different signs in the same area, though wihh how polarizing politics is now that could just be to avoid antagonism.