Biden will lose the nomination, but it won't be because of this. It will be because he served as the rubber stamp right hand man to Obama, who's legacy was resoundly rejected in the 2016 election. Many of Trump's votes came from people that had voted for Obama before, and had lost faith in their party. Biden will also lose because the Democratic party is now held totally hostage to radical anti American commies.
The Dems will elevate a crazy radical and then go on to a catastrophic defeat in 2020, which will bring about the destruction of the Democratic Party and 40 years of roaming in the desert until they get the American people right.