Democrat incumbent Sen. Christopher Belt of East St. Louis defeated Republican challenger Wavey Lester of Millstadt by an 8-point margin to earn a second term.
In total, Belt received 40,872 votes to Lester's 34,853, a difference of 6,019.
In East St. Louis, Belt received 5,016 votes to Lester's 127.
In St. Clair County, Belt received 34,229 votes to Lester's 29,732.
In Madison County, Belt received 1,121 votes to Lester's 105.
Belt, of Cahokia Heights, was first elected to the Senate in 2018, succeeding James Clayborne after he served more than 20 years in the Chamber.
Belt defeated Republican Tanya Hildebrand in 2018 by a margin of 59-41%.
State Democrat leaders gave Belt's committee close to $1.5 million in the month of October alone.
That support plus $630,000 he received from the party in September raised his total for two months above $2 million.