Ald. Bob Fioretti, shown working the crowd at last weekend's Mexican Independence Day parade, may be a longshot for mayor, but he could force a runoff, some observers say. | Richard A. Chapman/Sun-Times
Ald. Bob Fioretti is facing an uphill battle against Mayor Rahm Emanuel , but don’t count Fioretti out. If Chicago Teachers Union President Karen Lewis joins Fioretti in challenging the unpopular incumbent, it could make it more difficult for Emanuel to get the 50 percent-plus-one votes he needs to avoid a runoff.