watching a bunch of big primaries in three states. arizona, florida, and oklahoma. and how the president is playing into the top races there. in arizona, you have three republicans battling it out to be the party's pick to replace jeff flake in the senate. it's a race that could tell us a lot about the state of the republican party in the trump era and how much it's changed since arizona voters first sent the late john mccain to washington. in florida, a test of the trump endorsement. can it left desantis to victory tonight in the republican primary for governor? lots to cover. let's kick it off with caskasie hunt in scottsdale, arizona, on the road for our midterm coverage. walk through the state of play in arizona. >> reporter: so, hallie, this is a three-way race, but it is among three republicans. it is really about one person, and that is president trump. you have had, of course, john mccain, now no longer on the public stage, and senator jeff