Polling shows Donald Trump leading the Grand Canyon State's primary, where the victor on Tuesday will claim all of the 58 delegates. The businessmans immigration proposals have boosted him there, along with support from former Gov. Jan Brewer and Sherriff Joe Arpaio, both of whom are well known for their strict and controversial views on the issue. Ted Cruz is also competing in Arizona, and an upset would be a significant victory for those hoping to thwart Trumps path to the 1,237 delegates needed for the nomination and create an open convention.