With the help of a congressional remap and a boost from President Obama's reelection turnout, Democrats won five out of six targeted races that were bitterly contested in Illinois.
Each side poured millions of dollars into the races, including money from outside groups.
One SuperPAC, CREDO, went on a mission to "Take down Joe Walsh," and succeeded.
"Illinois voters sent a clear message to the Tea Party by voting out Joe Walsh, one of their loudest mouthpieces in Congress," said Eric Ming, New Media Director of CREDO SuperPAC. "We couldn't be happier with the voters of Illinois for kicking out the most offensive Congressman in the country."
The House Majority PAC, which spent $3.7 million in Illinois to try to pick up Democratic seats, said out of the three states it targeted in the country, Illinois was most successful in reeling in Democrats.
A congressional remap "obviously played a significant role," said Andy Stone, House Majority PAC spokesman. "I think the takeaway from Illinois, was a total rejection of the divisive, right wing Tea Party mentality."
Stone's PAC was behind the ad that attacked the three Chicago-area Republicans by using explosive images from Joe Walsh.
Here's how it played out:
8th District: Democrat Tammy Duckworth ushers out Tea Party Republican favorite Joe Walsh.
10th District: Democrat Brad Schneider, in perhaps the biggest upset of the night, ousts freshman Republican Bob Dold.
11th District: Longtime Republican incumbent Judy Biggert loses to Democrat Bill Foster
Bill Enyart claimed victory in the state's 12th district.
Cheri Bustos beats first-term Republican Bobby Schilling in the 17th District.
Republican Rodney Davis however, beat out a challenge by Democrat David Gill.