CHICAGO (AP) — More than a dozen candidates hoping to win Jesse Jackson Jr.'s former congressional seat plan to meet with Cook County Democratic officials next weekend for an endorsement session.

The Cook County Democratic Party has said it will back one candidate, which would give any potential replacement a boost particularly with fundraising and volunteers.

Jackson resigned from Congress last month citing his health and acknowledging he's under federal investigation reportedly for misuse of campaign finances. His vacancy creates a rare opening and numerous candidates have indicated that they're interested in the seat. Jackson first won the Chicago area seat in a 1995 special election. It's largely Democratic territory including Chicago neighborhoods and suburbs.