Perry Johnson's trader consensus lead at 58% implied probability in the Michigan Republican gubernatorial primary reflects his heavy self-funding and aggressive ad spending, which propelled a slight edge over U.S. Rep. John James (21%-20%) in the April Emerson College poll of likely primary voters and a tie in an earlier survey, amid high undecideds exceeding 30%. James trails at 29% despite name recognition from past statewide runs, hampered by a May 14 court injunction won by Johnson halting his campaign's nominee-like claims and mutual petition signature challenges filed against both frontrunners for August ballot access. Former Attorney General Mike Cox's 13% share gains from grassroots organizing, as the competitive field awaits petition validations and potential debates before the primary.