Rep. Martha McSally (R-Ariz.) is the front-runner in Arizona’s heavily contested GOP Senate primary, but she still trails Rep. Kyrsten Sinema (D-Ariz.) in a hypothetical general election match-up, according to a new poll. A poll conducted by Phoenix-based OH Predictive Insights (OHPI) has McSally ahead by 8 points over her toughest primary opponent, former state Sen. Kelli Ward (R), 35 percent to 27 percent. Former Maricopa County Sheriff Joe Arpaio is far behind in third, with 15 percent. Twenty-three percent of voters remain undecided going into Arizona’s primary on Aug. 28.