The AP declared Eileen O’Neill Burke the winner in the Cook County state’s attorney race just before 9 p.m. in one of the most closely watched races on Election Day in Chicago.

Eileen O’Neill Burke declared victory Friday afternoon after the latest vote count showed her leading by 1,566 votes in a race where more than 527,000 votes were cast. O’Neill Burke said she had a “mathematically insurmountable lead.”

The latest update in vote totals from the Associated Press came just after 12:30 a.m., as O’Neill Burke continued holding a slight edge over Harris. As of the most recent tally, fewer than 10,000 votes separated the pair. More votes will be counted in the coming days. 

Retired judge Eileen O’Neill Burke is facing off against lobbyist and former prosecutor Clayton Harris as they each vie to become state’s attorney for the nation’s second-largest prosecutor’s office.

Two Democrats are vying to replace outgoing Cook County State’s Attorney Kim Foxx. The attack ads are flying and money is flowing in as the two candidates are attempting to highlight their differences.