Republican Joni Ernst will be the first woman ever elected to represent Iowa in the U.S. Senate.
Ernst battled in a race, often seen as a dead heat, to earn the Senate seat being vacated by the retiring Tom Harkin.
With 73% of the precincts reporting about an hour-and-a-half after polls closed, Ernst had 51% of the vote in Iowa.
Democrat Bruce Braley had 45% of the vote.
That support for Ernst grew as results were counted. With 99% of precincts reporting, Ernst held 52% of the vote.
Ernst delivered remarks thanking her supporters in an acceptance speech just after 10:30 p.m. on election night.