Not that their endorsement brings or votes or money to Bernie. Sander's age and health issues will force him out just as Biden will be forced out. That leaves...not much. Lie-a-watha? They are doomed.

"The Democrat Party looks like Titanic survivors. Partying and celebrating one moment, and huddled in lifeboats freezing the next". Hatari 2017

"Hokey religions and ancient weapons are no match for a good blaster at your side, kid." Han Solo