Yep, you’ve stumbled on to the greatest issue or the Democratic Party. This is a fight for the heart of the left in the United States, and it’s a brutal one. It’s clear that that young voters are not happy with the right, with the status quo, or with more moderates. Most people I know, who are on the left, my age support Bernie or Warren. Most of their parents support Biden, Buttigieg, or Bloomberg.
As I’ve continuesly maintained, Jewish votes in the US tend to swing hard left, and Bernie would have their support. Indian-Americans are generally conservative, or at least seen as conservative, yes. Though again, younger Indian-Americans have actually started to become a little more left. Young Muslims are almost all on the left too. The biggest opposition group to the left in the US, besides your average conservatives, are the Protestants (aka Evangelicals). They swing hard, hard right and generally go against everything the Bible says and stands for when casting their votes.
Statistics and actual voting have shown that Sanders attracts the Independents. Where he loses a shiton of support is amongst Moderates, hence why I say this is a battle for the heart of the party more than for the office of President at this point. If we lose this election I’ll blame the Moderates once again instead of the Conservatives.