Kelly joins Illinois Lt. Gov. Juliana Stratton, who jumped into the contest last month and has been endorsed by Sen. Tammy Duckworth and Gov. JB Pritzker. Rep. Raja Krishnamoorthi is also expected to announce his bid, and Rep. Lauren Underwood continues to eye the seat.

South suburban US Rep. Robin Kelly becomes the second candidate to enter what’s expected to be a crowded field to replace retiring US Sen. Dick Durbin.