The metro-east is represented by a Democrat and two Republicans in the U.S. House: Rep. William Enyart, D-Belleville, in the 12th District; Rep. Rodney Davis, R-Taylorville, in the 13th District; and Rep. John Shimkus, R-Collinsville, in the 15th District.
Data from the 2014 Almanac of American Politics shows how people voted in the 2012 presidential election:
* In the 12th District, 48 percent of voters chose the Republican candidate Mitt Romney and 50 percent chose President Barack Obama, the Democrat candidate.
* In the 13th District, voters were divided, with 49 percent choosing Romney and 49 percent voting for Obama.
* In the 15th District, 64 percent voted for Romney and 34 percent voted for Obama.
Earlier this month, the Cook Political Report released ratings that listed both the 12th and 13th District races in the "tossup" category.
In the November election, Davis is up against former Madison County Judge Ann Callis, a Democrat. The 13th Congressional District stretches from the Edwardsville area to Champaign and Springfield.
Enyart faces Republican state Rep. Mike Bost, of Murphysboro, and Green Party candidate Paula Bradshaw, of Carbondale.
The 12th District encompasses 12 counties, stretching from Alton in Madison County to Cairo in the state's southern tip.
Shimkus, the 15th District incumbent, is running against Democrat Eric Thorsland, of Mahomet.
The district sprawls across 32 counties: south to the Kentucky border, east to the Indiana border, north to Champaign and west to Madison County.