Iowans haven’t voted a sitting U.S. senator out of office since 1984, but a third poll taken since the June 2 primary shows Senator Joni Ernst slightly trailing Democratic nominee Theresa Greenfield.
One poll might be dismissed as a fluke. Two polls might be explained away by the fact that groups supporting Greenfield commissioned the surveys. But Selzer & Co, which conducts the Iowa Poll for the Des Moines Register and Mediacom, has no dog in this fight.