If Cruz is really so good, lets see him take some of those States.
Cruz will get some delegates in the proportional states, and should win NE, IN, SD, MT and possibly NM. He will also do well in CA.
Here is some math for the Trump supporters: If Trump gets 6 delegates tonight, he will have 746 delegates. That means he needs 491 more delegates to win the nomination out right. But after tonight, there are only 715 bound delegates left. So Trump needs to get 68% of the remaining bound delegates. But Cruz and Kasich only need to combine for a total of 225 bound delegates to keep Trump from clinching the nomination. If Cruz wins NE, MT, SD, and IN, that is 149 delegates. That only leaves 76 delegates they need to pick up out of the remaining 566 delegates to force a contested convention.