Daniel F. Steck
Steck, a Democrat, appeared to have lost the 1924 race for Iowa's Senate seat against Smith W. Brookhart by a small margin, with Brookhart getting 447,594 votes to Steck's 446,840. Brookhart took office on March 4, 1925 and served until April 12, 1926 when the Senate voted by a margin of 45 to 41 to unseat Brookhart. Steck then took over the seat and served out the remainder of the term. On other occasions the Senate has settled election disputes before a Senator took office, but this is the only time the results were overturned after the Senator was seated.