Two moderates and a progressive vie for the Democratic nomination for Michigan's 7th District, but outside spending could influence the outcome.

Two moderates and a progressive vie for the Democratic nomination for Michigan's 7th District, but outside spending could influence the outcome.

Michigan’s Democratic Senate primary has been among the most contentious elections so far this year. With a week to go until the Aug. 4 primary, the matchup that pits Rep. Haley…