Internals: 64% Trump supporters say mind is made up, 63% of Cruz supporters say they can change their minds.
Trump waiting room has moved from Carson to Cruz.
Now that Carson is quickly falling out of favor, many of those voters would logically move to Cruz, as he is the "least establishment" of what is left in the field besides Trump.
What has been very consistent in the race is that the non-establishment candidates have maintained a combined polling of around 60%. Carson used to have a much bigger share of that, as well as Carly Fiorina. As Carson and Fiorina continue to fade, Cruz is the beneficiary.