The incumbent Treasurer Judy Baar Topinka, previously the only Republican elected statewide, made an unsuccessful run for governor rather than stand for re-election.

[citation needed] For the first time since the 1930s, all executive offices and control of the Illinois General Assembly was won by the Democratic Party.

[2] Turnout by county[2] All 19 of Illinois’ seats in the United States House of Representatives were up for election in 2006.

No seats switched parties, leaving the composition of Illinois' House delegation 10 Democrats and 9 Republicans.

Judy Baar Topinka Republican Alexi Giannoulias Democratic Incumbent Treasurer Judy Baar Topinka, a Republican, did not seek reelection to a second term, instead opting to run for governor.