In the poll, 51 percent of Republicans said they would support Grassley again, but only 7 percent of Democrats and 23 percent of independents shared that view.
Notably, his job approval stood at 45 percent. The Des Moines Register said that is the lowest it has been since 1982. Grassley’s approval rating was one percentage point lower than the state’s other senator, Republican Joni Ernst.
Grassley was first elected in 1980, unseating Democratic incumbent John Culver in the year of Ronald Reagan’s presidential landslide win. He is the longest-serving Republican in the Senate — second only to Vermont Democrat Patrick Leahy in current seniority — and 10th on the all-time seniority list. Grassley is also the second-oldest member of the Senate, a few months shy of California Democrat Dianne Feinstein.
The Iowa Poll, conducted June 13-16, for the Des Moines Register and Mediacom by Selzer & Co. of Des Moines, was based on telephone interviews with 807 adult Iowans, 630 of whom were listed as likely voters. The margin of error ranged from plus or minus 3.5 percentage points to plus or minus 3.9 percentage points.