This poll seems to be saying that as candidates drop out, their supporters are going to Cruz, Rubio and Kasich.
My opinion is that people (except for die hard Trump supporters) are sick of the 24/7 negative news and want it to go away. So the attack ads on Trump by the establishment types has worked.
It’s also kept any negative focus off of the other candidates.
Especially regarding Carson. It appears Cruz has been picking up the Carson voters.