Here is where to find political & celebrity endorsements of the democratic candidates.

https://en.wikipedia.org/wiki/Endorsements_in_the_2020_Democratic_Party_presidential_primaries

I don't think endorsements matter that much but it is interesting to see who has endorsed which candidate so far. It is being updated all the time.

If you know of an endorsement that is not there for a candidate, you can add it if you have a link.