Carl DeMaio called the Tea Party "the conscience of the accountable-government movement."
The Michigan Republican blasted his opponent for running a "despicable smear campaign."
Republicans Clint Didier and Dan Newhouse are atop field to succeed retiring Rep. Hastings.
The ex-Michigan Democratic congressman won't be making a return to Washington.
Rep. Tim Huelskamp (R-Kan.) narrowly defeated primary challenger Alan LaPolice.
The Michigan libertarian hero was an early target of business-minded Republicans in D.C.
Primary opponent had earlier questioned whether Conyers had returned enough valid signatures.
The GOP incumbent easily beat back unlikely challenge from the district's former congressman.
Debbie Dingell looks set to succeed her retiring husband, the longest serving House member.
Ex-state Senate Leader Mike Bishop gets nomination over Tea Party hopeful.