A Democrat could challenge Biden in a primary, but the party chose not do do anything, even though many party officials are concerned with Biden and his age. It has happened a number of times. I believe the last time a Democrat challenged an incumbent was Carter/Kennedy. And of course on the Rhino side more recently Buchanan unsuccessfully challenged G-Dub. I think Newsom would be a lot more popular choice on the blue side that Biden.Ya but right now there isn't really an option to take bidens place. There are a couple of options to take trumps place. Republicans simply need to vote for those options. Which should be easy and obvious. I mean we are talking about trump here. He is a disaster. Daily. Just saw that the bomb squad had to go to the judges house today because today is the final day in court for trumps new york business case. Literally everyday there is a trump scandal. How stupid do you have to be to vote for the guy.
I don't know any Democrats or Independents that are excited to vote for Biden. I unfortunately know many Republicans that are behind Trump (and if you are in Utah you probably do too), but most in my circle simply see Biden as a default, not as a good choice. If Trump wins don't be surprised.