There are only five winner-take-all contests for the remaining 20 states that will award delegates between now and June 7. Three of those will take place on the last day of elections.

But the remaining winner-take-all states are relatively small. Between Delaware, Nebraska, Montana, New Jersey and South Dakota, there are only 159 delegates up for grabs, or less than 18 percent of the outstanding delegates.

There is no polling in most of these states, but Cruz will likely be favored in the three Great Plains states, while Trump will be looking for victories in the two states in the Northeast.

That would mean Trump only takes 42 percent of the delegates in the winner-take-all states, putting him behind the 55 percent pace he needs to maintain overall to win the nomination outright.