As far as Rezko. . .I found this:

Obama's dealings with Rezko buy a parcel of questions :: CHICAGO SUN-TIMES :: Mark Brown

A question of judgment
You'd get the impression that the normally glib Obama was dissembling.

It would appear to me that Rezko was trying to do Obama a favor by buying the property, the extent of the favor dependent on whether or how Rezko developed his parcel.

Obama said it was always his understanding that Rezko, a real estate developer, intended to build on the lot. It would be more of a favor if he didn't. Rezko definitely did Obama a favor by selling him the 10-foot strip of land, making his own parcel less attractive for development, although still legally buildable.

Rezko is somebody who collects politicians, doing them favors in hopes of a future return on his investment. His main foot in the door is political fund-raising, but he also looks for a more personal approach, such as steering real estate business to the wife of Gov. Blagojevich.

The only thing that separates Rezko from other insiders who play this game is that he seems to operate under a longer time frame, not necessarily seeking an immediate payback.

Rezko's MO is such that any smart, honest politician should have kept him at arm's length long before last month's indictment, wherein may lie Blagojevich's excuse.

But what of Obama, the political wunderkind from whom so much is expected because so much talent and promise has been given? What's his excuse?

I'm one of those who nominated Obama for his place in American history before he even got to Washington.

People ask me what he has accomplished to deserve all this attention, and what I tell them is that it's not what he's done as much as what he could do. His potential is vast and undeniable.

But now we must question his judgment -- no small matter in a man who would be president.

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"No one believes more firmly than Comrade Napoleon that all animals are equal. He would be only too happy to let you make your decisions for yourselves. But sometimes you might make the wrong decisions, comrades, and then where should we be?"
- George Orwell Animal Farm