Tammy Duckworth's IL US Senate has switched sides since 1998.

1992-Moseley Braun-D replaced Dixon-D
1998-Fitzgerald-R replaced Moseley Braun-D(Scandals involving Moseley Braun-D- meeting the Nigerian dictator.)
2004-Obama-D replaced Fitzgerald-R
2010-Kirk-R replaced Obama/Burris-D)Blagovich-D selling this seat.
2016-Duckworth-D replaced Kirk-R
2022- seat will remain in the Democratic column.