Former Rep. Jesse Jackson Jr. formally launched his comeback bid for Congress on Tuesday, saying in a video shared with Axios he needs to "get back on the playing field and fight for my constituents."

Why it matters: A poll that Jackson's exploratory committee released last month suggests he is a strong contender for the seat he resigned in 2013 before being convicted and imprisoned for stealing campaign funds. • The seat, which covers parts of South Chicago and the rural and suburban counties to the South, is coming open as Rep. Robin Kelly (D-Ill.) runs for U.S. Senate. • Jackson joins a crowded field of Democrats vying for the seat, including state Sens. Robert Peters and Willie Preston, Cook County commissioner Donna Miller, Water Reclamation District commissioner Yumeka Brown and

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