Memory Trouble

That was fast:

State lawmakers are calling for a criminal investigation into whether U.S. Sen. Roland Burris committed perjury...

Why, you ask?

The development comes after the Chicago Democrat failed to initially disclose under oath to a House panel that he was hit up for campaign cash by former Gov. Rod Blagojevich's brother.

The good news is that he still says he didn't pay for the appointment to the Senate.

Burris' statement offers the third version of events he has given about his discussions concerning the Senate seat...

So, why change stories now? 

Did he just recall that the gov's bro 
asked for dough?

Or... and this is sheer speculation...
did he get wind that the Feds had already heard about that conversation?

UPDATE:

The affidavit, released Saturday by Burris' office after it was first reported by the Chicago Sun-Times, said Robert Blagojevich called him three times — once in October and twice after the November election — to seek his fundraising assistance.

Robert Blagojevich's attorney has said his client believes one of the conversations was recorded by the FBI.