Depends on what the definition of "talked to" is.
Right after Blago was arrested, Obama claimed he never talked to Blago about the Senate seat. After all, Obama claims he's had little contact with Blago. NBC Chicago catches Obama in a whopping lie. Some redacted portions of an Obama subpoena request have been unearthed:Obama had a secret phone call with Blagojevich
Redacted portion: President-elect Obama also spoke to Governor Blagojevich on December 1, 2008 in Philadelphia. On Harris Cell Phone Call # 139, John Harris and Governor’s legal counsel discuss a conversation Blagojevich had with President-elect Obama. The government claims a conspiracy existed from October 22, 2008 continuing through December 9, 2008.6 That conversation is relevant to the defense of the government’s theory of an ongoing conspiracy. Only Rod Blagojevich and President Obama can testify to the contents of that conversation. The defense is allowed to present evidence that corroborates the defendant’s testimony.