Charles E. Grassley won with 70.2% of the vote (1,038,175 votes), ahead of Arthur Small with 27.9% (412,365 votes).
The margin between the first two candidates was 42.3 percentage points (625,810 votes). The party margin (Republican share minus Democratic share) was a Republican lead of 42.3 points.
Compared with the previous comparable race in the same area, the party margin moved 52.7 points toward Republicans. The winning party changed.
1,479,228 votes were counted in this race, for 5 candidates or options.
More races: all races, candidates and analysis.