Newly released tapes seem to show that Burris promised to raise money for Blagojevich through his brother before Blagojevich appointed him to fill Obama's vacated Senate seat. While there is no direct quid-pro-Quo, the implication is all but unmistakable. This looks really bad, but will it be enough for him to leave (be booted from) the Senate? It is a little to early to tell.
More at http://ace.mu.nu/archives/287773.php and http://www.chicagotribune.com/news/local/chi-new-burris-full-transcriptmay27,0,6395405.story.