The publicity stunt offered a peek at the divisive campaign that’s likely ahead.

U.S. Sen. Joe Donnelly takes questions from the media Monday, Aug. 21, 2017, after speaking at the UAW in Anderson Ind as part of his "Hoosier Highways" RV tour to launch his re-election campaign. As the first-term Indiana Democrat arrived at a campaign stop in Anderson, a town northeast of Indianapolis, the sounds of blaring horns and strummed guitars rolled over the parking lot.