 Foster was challenged by Republican nominee State Senator Randy Hultgren and Green Party nominee Daniel Kairis.Despite winning the endorsements from the "Chicago Tribune", the "Chicago Sun-Times" and "The Daily Herald", Foster lost to Hultgren 51%–45%.In May 2011, Foster sold his home in Geneva, moved to Naperville and announced plans to run for Congress in the 11th District, which encompasses Aurora, Joliet, Lisle in addition to Naperville.