The Improvement Association PAC’s power in the county is threatened when an unlikely candidate enters the race for county commissioner. Plenty of people outside the PAC now have their own ideas about how to build Black political power here. Zoe examines what this election could mean for the PAC’s future.   Our newest podcast, “The Preventionist” is out now. Search for it wherever you get your podcasts.To get full access to this and other Serial Productions and New York Times podcasts on Apple Podcasts and Spotify, subscribe at nytimes.com/podcasts.To find out about new shows from Serial Productions, and get a look behind the scenes, sign up for our newsletter at nytimes.com/serialnewsletter.Have a story pitch, a tip, or feedback on our shows? Email us at serialshows@nytimes.com