@Coffeeaddict
Yes Sanders supporters will be upset if he has a delegate lead on the first ballot and after delegates are released he loses to Biden on a subsequent ballot.
That doesn’t mean those who are loyal Democrats will not vote for Biden against Trump.
That doesn’t mean some of the diehard Bernie supporters who did not vote for Clinton in 2016 won’t vote for Biden BECAUSE they have detested the Trump Presidency and realize had they not sat out in 2016 Trump might have lost,
All of the ardent Sanders supporters I know well have pledged to vote Blue no matter who this year.
So far it looks like a Biden/Sanders race, but in the past surprise candidates have been nominated by the National Convention. Too early and too close to call.