Tonight's show in the City of Chicago (8:30 pm, Ch. 21) - Analysis of the likely Democratic (Barack Obama) and Republican (Jack Ryan) U. S. Senate Primary winners and Exclusive Video clips of six Republican and seven Democratic Senate Candidates at the WBEZ, 91.5 FM Chicago, Chicago Public Radio, Republican and Democratic Senate Candidate Forums, which aired live on WBEZ radio on Feb. 3 and 4, 2004, respectively, but have not been aired on television prior to airing on "Public Affairs."