It seems like the country is totally polarised because the most extreme people shout the loudest.
People who are undecided don’t make memes or aggressive twitter posts about how undecided they are etc.
And while the GOP establishment are fully on Trumps side there is a sizeable contingent of people who are usually republicans that are put off by trumps bullshit, but still don’t really want to vote for a “lib” like Biden either. And if he “supported hamas terorrists” that very well could be more than enough to put them off.