Sen. Chuck Grassley (R-IA) shows a massive lead in a hypothetical matchup against candidate and former Rep. Abby Finkenauer (D-IA) in Iowa’s U.S. Senate race, according to a poll. Grassley, the long-time incumbent, showed an 18-point lead over Finkenauer, among likely Iowa voters, 55 percent to 37 percent, in the latest Des Moines Register/Mediacom Iowa Poll. Seven percent also said they were unsure and going head-to-head matchup between the long-time incumbent and Finkenauer; one percent said they would not vote.