The quote:
“Given Joe Biden’s incredible record, given Donald Trump’s terrible record: he should be mopping the floor with Donald Trump. Joe Biden is running against a criminal. It should not be even close. And there is only one reason it is close. And that is the president’s age.”
Biden is making his case, the same way he always has.
Trying to defeat your primary opponents is not undemocratic.
When a candidate loses an election, they should take responsibility for the outcome. Blaming the opponent for “stealing” an election is classic MAGA-speak.