Update

Maybe they do have the evidence of an actual pay to play on Blago after all:

[T]wo sources close to Jackson told CNN that, in 2002, Blagojevich -- then running for governor of Illinois -- solicited a $25,000 campaign donation from Jackson, which he did not get.

At the time, Jackson's wife, Sandi, was a candidate for the job of director of the state's Lottery Commission, a post she did not win, the sources said.

After Blagojevich took office, in early 2003, he told Jackson something to the effect of, "You see what $25,000 would have done?" the sources said.

In 2006, Jackson reported the incident, which he believed to have been an attempt at a shakedown, the sources said.

But is it part of the indictment?

Spokesman Kenneth Edmonds described Jackson's interaction with federal authorities this way: "As a responsible citizen and elected official, Congressman Jackson has in the past provided information to federal authorities regarding his personal knowledge of perceived corruption and governmental misconduct.

"This was completely unrelated to the current investigation regarding the U.S. Senate appointment. And it is absolutely inaccurate to describe the congressman as an informant," Edmonds said in a written statement.

And if not, does the indictment have enough hard evidence of an offer? Even this is rather oblique - a donation coinciding with appointment, but it's not made explicitly contingent until afterward, and that is open to spin.

Tricksy politicians.