So, Sanders should have no problem winning Alaska, Hawaii and Washington tomorrow - all of which happen to be caucuses and his appeal in Wisconsin makes that one seem like a given after his Michigan win.
So, that's four states for Sanders before we run into New York which is going to be the toughest hill for him to climb of what's left.
After that? Connecticut, Delaware, Maryland, Pennsylvania, Rhode Island, Indiana, Guam, West Virginia, Kentucky, Oregon, Virgin Islands, Puerto Rico, California, Montana, New Jersey, New Mexico, North Dakota, South Dakota and D.C.
Pennsylvania and New Jersey will be tough territory given their proximity to Clinton's New York and their demographics. Islands could go either way but will likely favor Clinton slightly due to name recognition in Guam and Virgin Islands and heavily in Puerto Rico. D.C. is obviously impossible for Sanders to win. While it is a major city with plenty of young voters, there's also a ton of black and establishment voters there to help Clinton.
The rest are all pretty easy victories that aren't much of a stretch. Even California now seems rather doable.