Heard that Schumer is throwing his support behind Ellison too.
Schumer's just trying to follow the direction of the wind. He knows his time is coming soon too if he doesn't reform himself as well. Better to join the future earlier rather than later.
Personally, I've been a supporter of Keith Ellison for a while now. He's one of the best Democrats we have and, while I think something like a Presidential run would (unfortunately) be too controversial, he could do enormously good work as head of the DNC.
I'd want Ellison as the DNC chair if the path of congressman/DNC chair continues. If it goes to the full-time dedicated route (like it should), then I'd want Tom Perez.