Theresa Greenfield is challenging GOP Sen. Joni Ernst for US Senate in Iowa.<br />Polls in Iowa closed at 9 p.m. local time and the results are rolling in, says Business Insider.<br />Ernst is an Iowa Army National Guard veteran and was first elected to the US Senate in 2014.<br />Theresa Greenfield is an urban planner, real estate developer, and first-time political candidate.<br />Ernst serves on the Senate Committee on the Judiciary, Armed Services, and Environment and Public Works.<br />Currently, the US Senate is made up of 53 Republicans, 45 Democrats, and two independents.
