But you can see the logic, right? Trump says build a wall, after Paris his poll numbers skyrocket, etc. What is the one thing politicians care about? Getting elected or re-elected. You need high poll numbers to do that.
So this is not really a case of Trump causing it, he just stumbled across the right answer first and now all the others are copying him....because why? They all want the same thing...to stay (or get into) office.
Cruz was speaking true to idiocy long before Trump was on the scene.