Incumbent Rep. Monica Bristow (D-Alton) defeated Republican Mike Babcock by a margin of 50.5 to 49.5 percent for Illinois' 111th House District.
At least $3.4 million was poured into the race, considered to be the most expensive House race in the entire state.
According to a piece in Capitol Fax Monday, since April 1, both the parties and outside groups have raised $2.4 million for Bristow and $1 million for Babcock.
Bristow faced her first election, having been appointed to the seat a day after Dan Beiser stepped down Dec.17, 2017, to spend more time with his family.
Beiser had held the seat since 2004. He also had initially been appointed to the seat after Steve Davis stepped down in 2004.
Babcock, serving as Wood River Township supervisor, ran against Beiser in 2016 and lost by a margin of 52.6 to 47.6 percent, a difference of 1,953 votes.
Bristow was backed by House Speaker Mike Madigan who has directly or indirectly spent at least $127,775 on her campaign through the end of October.