IMO I first off don't believe the polls that put Trump so far behind. I don't buy that the people of the US are behind Burn Loot Murder.
The majority of people are not behind the protests and certainly not behind the rioting. These protests are probably the best thing that could have happened to Trump, however even with that taken into account, the fact that he is so much behind in so many national polls, makes me think that the path to victory won't be easy for him.
People hated Clinton, but they don't really hate Biden. If anything they sorta feel sorry for him, because he seem old and frail. We'll see what happens with the debates.
If Trump wins, you really have to wonder how much move divided people can be.