Iowa's 4th Congressional District covers 39 counties, from the northwest corner through much of north-central part of the state. It's the largest and most conservative district--38 percent of registered voters are Republicans.
That hasn't deterred Democrat Kim Weaver from launching a campaign to unseat seven-term incumbent Steve King.
In fact, it has attracted the attention of some out-of-state politicians. At an event in Ames, Congressman Eric Swalwell, (D-Calif.) who was born in the district, came through to campaign for Weaver.