Biden is simply too old. As in Bernie, as is Elizabeth Warren.
Then,.like when McCain ran, we look at the VP. It wasn't McCain that lost, it was the nighmare that was his VP choice. It would be like Biden choosing Cortez.
She's legally too young and can't be President. She also needs more experience. As we've seen with Trump, you can't run the government if you have no clue as to how it works.
The country cannot continue to be run by my generation. As we've seen from the Congressional Testimony of the Internet moguls, you can't regulate these industries when you haven't the first clue how they work.