U.S. Senate candidate Alexi Giannoulias says former Illinois governor Rod Blagojevich's lawyers have subpoenaed him to testify at Blagojevich's corruption trial.
Giannoulias said Sunday that he introduced a friend of President Barack Obama's to a union official. The friend, Valerie Jarrett, allegedly was Obama's choice to replace him in the Senate after he was elected president.
Prosecutors say Blagojevich sought favors from the White House in return for Jarrett's appointment and delivered the message through the union official.
Blagojevich has pleaded not guilty to charges of trying to sell or trade the appointment to the Senate seat.
Giannoulias, the Democratic state treasurer, is locked in a contentious race for Obama's old seat with Republican Congressman Mark Kirk.
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