Nebraska is a fool's gold. At most, Kerrey is going to make it embarrassingly close for Fischer, but I just can't see him winning.
As of Arizona, Carmona has a momentum but it faded since then.
North Dakota is a pure tossup and I can't make a projection.
Montana is oddly overlooked. Personally, I think this is most likely Republican pickup.
Why is Montana more likely to flip than Nebraska? Tester has actually led in a few recent polls, while Kerrey has never led in any poll. As for North Dakota, independent polls as of late have shown Berg establishing a clear advantage.
I think all three of those are gone, but if Democrats manage to retain one, it'll definitely be Montana.