Skyline of Des Moines, Polk County's largest city and the capitol of Iowa. Polk County is the 3rd Congressional District's most populous county. It is also the only county in the district where registered Democrats outnumber Republicans.
Iowa will hold its primary on Tuesday, June 3. Democratic Senator Tom Harkin is retiring and that’s set off a domino effect of politicians vying for higher office and this midterm election could make history if voters send a woman to Washington. It’s just one of two states that have never done so or elected a woman as governor; the other is Mississippi.