Tuesday night, my father won the Arizona Republican primary for U.S. Senate. Like so many times before, I stood behind him on stage proud and hopeful for the future—for both the state of Arizona and our country. It is no secret this seemed to have been the summer of anti-incumbency rhetoric in numerous Republican primaries. This is probably most evident in the Charlie Crist/Marco Rubio race in Florida, where Gov. Crist left the Republican Party to run as an independent against the much more conservative Rubio. It is a complicated time in politics, especially Arizona politics. I recently moved back...