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A nine-week trial included explosive testimony about drug-fueled parties involving the government’s star witness and accusations that Illinois Gov. Rod R. Blagojevich, a Democrat, discussed a state job for a donor after the donor handed over a $25,000 check for Mr. Blagojevich’s campaign.

The testimony barely touched on the relationship between Mr. Obama and Rezko, who has known the Democratic presidential candidate since he entered politics and was involved in a 2005 real estate deal with him. Most of the focus was on shakedowns prosecutors said Rezko arranged when he was a top adviser to Mr. Blagojevich.

Neither Mr. Blagojevich nor Mr. Obama has been accused of wrongdoing.