Sen. Joe Donnelly, D-Ind., is treading water in Morning Consult's "2018 Midterm Wave Watcher."
The polling firm reported Wednesday that Donnelly's approval rating has dipped a bit this year, as have the ratings for most incumbent senators in 10 states thought to be competitive in advance of the November general election.
Donnelly began the year approved by 43 percent of registered voters in Indiana and disapproved by 30 percent. In May, 41 percent approved of him and 34 percent disapproved.
Approval fell and disapproval rose for seven other senators – six Democrats and a Republican. Sen. Heidi Heitkamp, D-N.D., saw her approval rating drop from 51 percent to 44 percent and her disapproval rating jump from 34 percent to 45 percent.
Two senators – Democrats Jon Tester of Montana and Tammy Baldwin of Wisconsin – each gained 1 point of approval and lost 1 point of disapproval from January to May. Tester, at 52 percent, was the only senator of the bunch to have an approval rating higher than 50 percent in May.
Granger resident Donnelly is being challenged in the general election by Republican Mike Braun of Jasper and Libertarian Lucy Brenton of Indianapolis.