All this. 2 is being dense as usual. If Bernie "won" Super Tuesday with his 35%, it was going to be too late to stop him. That doesn't make it any less true that 65% of the Dem voters wanted someone more moderate.The first statement isn't quite right. Biden wasn't necessarily the first choice of the voters but he was the compromise consolidation choice and it had to be done very quickly or the consolidation would be too late. The majority of the party (both the leadership and the electorate) did not want Sanders to be the nominee but they would be almost forced to give it to him if he succeeded in getting through the primaries with something like 35% of the vote and a plurality of the delegates.
In 2016, Trump did not go over 50% in a state primary until New York in April but by then it was far too late to stop him because he won too many primaries and delegates with a minority of the vote. He still only won 45% of the primary vote overall despite having little or no opposition after early May. The Democrats didn't want to make the same mistake.
The second statement isn't true either. Voters didn't "narrowly" choose Hillary over Sanders. She beat him handily. The contest was for all practical purposes over by April but he wouldn't concede until the convention.
I don't worry about the "communists." That's your obsession.