He could somehow win black voters and urban white voters? But if you'd asked the same thing about Donald Trump in late 2012, what would any of us had said?
It all depends on context
So you are literally just saying "but Trump" and "blacks/Millennials", without addressing any of the counterpoints to that.
Also how does he win Iowa or New Hampshire that way?
I'm indicating that it would be difficult for him to build a winning coalition and that we have no idea. Anyway, my actual thoughts.
-Among the first four states, NH and SC are the only ones he has a chance of. He could possibly win Southern NH by enough to cancel out the northern parts of the state, and get a small plurality there. Then, momentum would get him a decent-sized SC win. This leads to this sort of map:
Kirsten Gilibrand
Kamala Harris
Kanye West
Sherrod Brown
So Kanye wins on a black-young coalition by being Bernie with appeal to African-Americans, I guess.
Oh yeah I can totally see Kanye West winning the Dakotas, Montana, Maine, Wyoming, Nebraska and Kansas.
And why would he be appealing in the white flight Boston exurbia region that is southern NH?
#Dakotans4Kanye
Also no way the Northwest votes for Kanye after he appropriated our name. 
I'm gonna assume by the time the primaries hit the NW, he'll be the presumptive nominee, and all of them would be walkways.
