Why should the race not be close? There are two main party's in the U.S., with most of the population belonging to one of the two. The last landslide election was in 1984, and that was only an 18% difference in the popular vote. I expect to see this election won by a slim margin, even after the country suddenly noticed that Joe isn't doing well. It's almost always just a very small group of undecided voters that swing the election one way or another.
For the record, I still think Joe has it in the bag. He'll get the democrat vote as long as he's breathing.