The district stretches from Chicago's Northwest Side into the western suburbs, including portions of Berwyn, Cicero and Riverside. It is one of the most heavily Latino districts in the country.
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Garcia is replacing Rep. Luis Gutierrez, who has represented Illinois' 4th Congressional District since 1993. The 63-year-old congressman announced last November he wouldn't seek re-election in 2018.
RELATED: Election 2018 Illinois results
Gutierrez said the only reason he was retiring was because Garcia was willing to run for his seat. The two share a long history and similar views on many issues. Both said there were no backroom deals preceding the announcement.
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"I would not have made this decision unless there was somebody who could step up and give new life to the agenda in Washington D.C.," Gutierrez said at the time.
Illinois Democrats elected to U.S. House of Representatives
In addition to Garcia, several Illinois Democrats were re-elected to the U.S. House of Representatives in their respective districts.
Incumbent Rep. Bobby Rush won in the 1st District along with Rep. Robin Kelly in the 2nd District and Rep. Mike Quigley in the 5th District. Rep. Raja Krishnamoorthi won in the 8th District.
Rep. Dan Lipinski won in the 3rd District beating Republican challenger and Holocaust denier Art Jones.