U.S. Rep. Mike Bost, a Murphysboro Republican, gives a victory speech at his election night party in Murphysboro on March 19. [Blue Room Stream] 

Republican incumbents for Congress and the Illinois House faced stiff primary challenges this year, but voters rewarded the incumbents, giving convincing approval to members of the Illinois House Freedom Caucus and a narrow victory to U.S. Rep. Mike Bost.