Blake Masters has taken a clear lead in Arizona’s Republican U.S. Senate primary, edging past Attorney General Mark Brnovich and businessman Jim Lamon, a new poll provided exclusively to Breitbart News ahead of its public release shows. The poll, conducted for the pro-Masters Super PAC Saving Arizona PAC, shows Masters with a four-point lead over both Brnovich and Lamon. Masters, at 22 percent, leads both Brnovich and Lamon — both of whom are at 18 percent — by more than the poll’s 3.46 percent margin of error. Another candidate, Mick McGuire, is down at seven percent and Justin Olson is...