Many of the city's black pastors supported seating Burris because of his scandal-free reputation - even though he was appointed by then-Gov. Rod Blagojevich after the governor was arrested.
But revelations that Burris attempted to raise money for Blagojevich while seeking the Senate job have eroded some of his support. Blagojevich is accused of trying to sell the Senate appointment.
A Burris spokeswoman didn't immediately return a phone message.