[Ingtar]

So, Bernie is probably ahead in Michigan and Washington. And no one polled Idaho or North Dakota.

[Trump20162020]

So, Bernie is probably ahead in Michigan

Nope, not at all. New poll was just released of Michigan about thirty minutes ago:

Biden 54%
Sanders 33%

Source

[Reaganez]

http://filesforprogress.org/datasets/2020/3/primary_polling/wa_3_7.pdf

Washington

Biden 47
Sanders 44
Warren 5

I guess all of Warren supports could back Bernie instead and half of undecideds break for Bernie. But I doubt it.