For most of his career, Johnson represented much of the more rural and conservative portion of Champaign County, along with portions of Ford and Douglas counties. After the 1990 census, Johnson was drawn into the same district as Democrat Helen F. Satterthwaite, who had long represented the other side of Urbana, as well as the University of Illinois at Urbana-Champaign. However, the new district was more Johnson's territory than Satterthwaite's; Republicans outnumbered Democrats by almost 3 to 1. It also didn't include Satterthwaite's old base at the U of I. At that election, Johnson won with 60 percent of the vote.