United States Senate election in Indiana 1998 Tags: Election.The 1998 United States Senate election in Indiana was held on November 3 1998. Incumbent Republican U.S. Senator Dan Coats decided to retire instead of seeking a second full term. Democratic nominee Evan Bayh won the open seat his father once held. thumbnail start date 1998-11-03 title United States Senate election in Indiana 1998 Learn more... Loading...