Highland Park Mayor Nancy Rotering is jumping into the Democratic field after last month's announcement Lisa Madigan wouldn't seek re-election.
Rotering ran a spirited campaign against Congressman Brad Schneider in the last year's Democratic primary. She landed more than 46 percent of the vote cast.
She won a high profile battle with the NRA as Highland Park enacted an ordinance banning assault weapons and high-capacity magazines.
State Representative Scott Drury and State Senator Kwame Raoul are also in the Democratic field.