Most of whom already support him. Nearly all of whom have already decided whether to support him or not.
At best, he moves some people who hate him from Cruz over to Kasich. That's not likely to change the delegate count much.
Mark my words, Trump won't have enough delegates by the convention. Even with very favorable assumptions in favor of Trump, every delegate model I've seen shows him coming up short.
If Trump comes up short, and is as brilliant as you think he is, maybe he will be able to negotiate well enough to pick up the majority. I wouldn't bet on it.
"You cannot pull a Colorado and get by with it in the information age."
Now, if YOU were objective, you'd realize that Cruz "pulled" nothing. Party leaders in Colorado made the rule change way back in August when they probably assumed the race would be over by the time they held their state convention, just as it has been for the last 40 years.
And most Cruz voters (not counting the ones who just hate Trump) dislike the establishment as much as Trump voters, so I don't see how they're all going to be upset when Cruz benefits from the rules, just as Trump has benefited from rules in other states to gain a disproportionate share of delegates.
There have been at least a dozen Cruz supporters who today told me they were switching to Trump. That is the “Colorado effect”. It isn’t going to be pretty.
Trump: The system is rigged, it’s crooked
https://www.youtube.com/watch?v=Dtarr2ru9uU
Trump’s new convention manager speaks out https://www.youtube.com/watch?v=IivP2Q12nnQ
Things are not static. It’s a mistake to think they are.