WASHINGTON--President Barack Obama heads to Chicago on Saturday for a two night visit--and is likely to visit his campaign headquarters in the Prudential Building, I am told.

Obama's stop at his headquarters comes as his national staff is coming off a two-day retreat--and some concern about slippage in key battleground states.

Obama is coming to Chicago for what now is five fund-raising events on Sunday, including one at his South Side home--actually his yard.

Added is an event at the Sheraton Chicago Hotel & Towers. That's in addition to a funder at the Bridgeport Art Center and three in Kenwood in the evening: the Obama residence on S. Greenwood, down the block at the home of Barbara Bowman, the mother of senior advisor Valerie Jarrett and a few blocks away at the home of Marty Nesbitt, a pal and the Obama campaign treasurer.