sentences:  On April 15, 2003, with six Democrats already running and three Republicans threatening to run against him,
  incumbent Fitzgerald announced he would not seek a second term in 2004,
  and three weeks later popular Republican former Governor Jim Edgar declined to run, leading to wide open Democratic and Republican primary races with 15 candidates, including 7 millionaires
  (triggering the first application of the Millionaires' Amendment of the 2002 McCain–Feingold Act), in the most expensive Senate primary in U.S. history.Obama touted his legislative experience and early public opposition to the Iraq War to distinguish himself from his Democratic primary rivals.Illinois Comptroller Dan Hynes won the endorsement of the AFL-CIO.