In this March 20, 2012 file photo, Democrat Debbie Halvorson speaks to supporters as she gives her concession speech in Homewood, Ill., after losing her primary election to U.S. Rep. Jesse Jackson Jr. in Illinois's 2nd Congressional District. (Seth Perlman -- Associated Press, File)


Former Rep. Debbie Halvorson (D) launched her campaign for Rep. Jesse Jackson Jr.'s seat in Congress on Monday, just a few months after Jackson defeated her in a primary. 

Jackson resigned from office Wednesday after spending several months on medical leave. He was facing a House Ethics committee investigation into possible campaign finance infractions. He was elected to a ninth term earlier this month. 

Halvorson was elected to Illinois's 11th district in 2008 but served just one term in the House before she was unseated by Rep. Adam Kinzinger (R) in the 2010 mid-term election. Prior to that, she was the first woman to become the first State Senate Majority leader. 

PROFILE: Who is Debbie Halvorson?