But there is one thing Cruz can still do to ensure that he wins on the second ballot or perhaps the third, when nearly all the delegates will be free agents: He can choose Gov. John Kasich as his running mate. Selecting Kasich is such an obvious choice for Cruz, one suspects he may have already decided to do it.
http://www.lifezette.com/polizette/how-cruz-can-ensure-a-second-ballot-win/