Washington (CNN) - Illinois Sen. Roland Burris is considering running for mayor of Chicago, potentially joining a crowded field of candidates that includes an ex-senator, current congressman and President Obama's former chief of staff.
Burris is leaving Capitol Hill at the end of the year after being appointed to fill the remaining two years of then-President elect Obama's Senate term.
A group of Burris supporters, not the Democratic senator, filed the nomination paperwork including at least 12,500 signatures needed to be considered for the mayoral ballot.
Kenneth Sawyer, a senior Burris aide, told CNN the senator is mulling a run for mayor, but added that "he hasn't made any decision yet" about whether he will launch a campaign to try and succeed retiring Mayor Richard Daley.
Burris' December 31, 2008 appointment to fill Obama's unexpired Senate term was controversial because it was done by disgraced Gov. Rod Blagojevich. The Senate finally relented and Burris was sworn into office on January 15, 2009. Two weeks later, the Illinois Senate unanimously voted to remove Blagojevich from office.
The filing deadline was Monday for the February 22nd election that is being closely watched by political types outside of Chicago because Obama's former chief of staff Rahm Emanuel recently left the White House to run for that office. Former Sen. Carol Moseley Braun is also running for mayor as is Rep. Danny Davis.