Half of Iowa's 50 Senate seats — even-numbered districts — are up for election this year. State senators serve four-year terms.Republicans already enjoy large majorities in both chambers in the Iowa Legislature and need to pick up a few more Iowa House seats for a supermajority, although they already control the governorship.FULL ELECTION RESULTS: PRESIDENT | U.S. HOUSE | IOWA SENATE | IOWA HOUSE | CONSTITUTIONAL AMENDMENTS | DALLAS COUNTY | GUTHRIE COUNTY | MADISON COUNTY | POLK COUNTY | STORY COUNTY | WARREN COUNTY | ESSENTIAL EMS | JUDICIAL RETENTIONNote: Results are unofficial until certified by county and state officials.CLICK HERE TO RETURN TO ALL ELECTION RESULTS.