Tony Rezko was obviously in trouble. He was a defendant in at least a dozen lawsuits, federal investigators in Chicago were poking around, and his name was in newspaper stories about corruption and fraud.

None of that stopped Rezko, a politically connected developer, and Sen. Barack Obama, D-Ill., from completing real estate deals a few years ago that resulted in the Obamas obtaining their dream house and the Rezkos buying an empty lot next door.

Nearly three years later, fallout from Obama's relationship with Rezko, who raised more than $150,000 for Obama's campaigns, continues to dog Obama on the presidential campaign trail. That distraction promises to linger as Rezko goes on trial on corruption charges starting Monday.

Obama, a Democrat, is not part of the case against Rezko, who is accused of shaking down companies seeking business with the state of Illinois. Obama has conceded it was a mistake to bring Rezko into his personal real estate dealings, although he has insisted there was nothing unusual about the developer buying a sought-after building lot in an upscale neighborhood.

But a review of court records, including new details of Rezko's finances that have emerged recently, show that the lot purchase occurred as he was being pursued by creditors seeking more than $10 million, deepening the mystery of why he would plunge into a real estate investment whose biggest beneficiary appears to have been Obama.

Obama's campaign emphasized Saturday that the criminal proceeding against Rezko "is not a case about Sen. Obama."

Obama's name is likely to surface during the trial, if only because $10,000 of the money Rezko is accused of extorting wound up in Obama's 2004 Senate campaign. There is nothing to indicate that Obama did any favors for Rezko, but there is ample evidence that Rezko did favors for Obama.

Obama has said he did not know why Rezko bought the lot. Business associates of Rezko said he wanted to help the Obamas expand their backyard and that he thought it would be a good investment to own a lot next to a prominent politician.

But Rezko's involvement was important because the owners of the house and the lot had stipulated that neither could be sold unless a deal for the other closed on the same day.

For at least two years before the property purchases, news articles had raised questions about Rezko's influence over state appointments and contracts.