If Biden and the Democrats win, they get two years. Then in the 2022 mid-terms they get tossed out of Congress in large numbers, both houses flip Republican, and Biden is stymied at every turn. Happened to Clinton. Happened to Obama. It'll happen to Biden if elected.
Why? Because the second the Democrats start enacting Leftist programs, ideas, and laws people will quickly sour on them hating things like $5 a gallon gasoline, high unemployment, more taxes, you-name-it. If you think Biden taking us back to say March or April of this year with heavy handed lockdowns of the economy and forced mask wearing is going to be popular, you are delusional. If done, it will do little or nothing to stop COVID. People will notice, and they won't like it. It's happened each time the Democrats got control and it's almost certain to happen this time too.