Depending how today goes, it’s pretty much down to Biden and Bernie.
Biden is more moderate and has a lot of support from blacks.
Bernie has more support from Latinos and millennials. So it’s six of one, half a dozen of the other.
Each have flaws too. There is no way Bernie can promise and deliver free stuff for everybody without taxing the crap out of the middle class.
Biden can barely complete a sentence sometimes, and he’d have Bernie in the dust if Obama endorsed him. Not even endorse him, just to say “I support Joe” would give Biden extra traction.