Reporting with Natasha Korecki
SEIU leader Thomas Balanoff, a key witness for the government, has just taken the stand.
Balanoff is expected to testify that Barack Obama called him before the election, giving him the green light to ask Blagojevich to appoint his friend Valerie Jarrett to his U.S. Senate seat.
He's also expected to say that Blagojevich told him he wanted a personal benefit in return for appointing Jarrett.
Early in his testimony, Balanoff says national union leader Andy Stern first raised Valerie Jarrett as a potential Senate successor in September 2008. As early as as October 2008, Stern said he talked to Jarrett and she said she was interested.