You’re still living in 2016 based on the names you put out there. Newsom is the obvious answer, who actually has been extensively discussed for this or next election. He has popular support among voters and the establishment Dems.
Others like Whitmer have plenty of name recognition nationally, and in her case especially a great story to run on (Republicans wanted me dead to shut down my political views, now I’m gonna take that perspective to the office of the president).
There are others, too, but if you’re still listing Tulsi Gabbard as a Democrat I am not surprised you’re not up to date on candidates; she not only left the Democratic Party (and wrote a book about it), she has shifted to the Right on abortion and LGBT+ right, even publicly supporting Florida’s “Don’t Say Gay” bill.
Those were literally all candidates in the 2020 primary? How am I in 2016, the primary candidates of note in 2016 were Clinton and Sanders.
Newsome is hardly new to the talk about potential candidates and is far from exciting. Whitmer is maybe a bit more appealing but we’ll see how much that holds when she starts talking to donors about funding her campaign.
Tulsi is exemplary of the issue with “moderate” democratic candidates, they’re all two bad days from starting to post about the “woke mind virus”.