The 2008 United States Senate election in Iowa was held on November 4, 2008. Incumbent Democratic U.S. Senator Tom Harkin sought re-election to a fifth term in office. Unlike all of Harkin's previous bids for re-election, he was not challenged by a sitting United States Congressman this year, instead facing small businessman Christopher Reed, who won the Republican primary by just a few hundred votes. As of 2019, this is the last time a Democrat won a Senate election in Iowa.