Cruz -- joins Trump in his claim to be a truth-teller. How many others will there be tonight?
Bush: maybe the bar is set higher for me, I'll have to earn this
Bush: They call me "Veto Corleone" because I vetoed a ton of things in Florida
Rubio: I owed thousands in student loans just four years ago
Trump makes his move with the first question -- he won't pledge to support the nominee.