Little more than a week after raising his right hand to be sworn in as Chicago's new mayor, Rahm Emanuel assumed the position again Wednesday -- this time to testify for the defense in the corruption trial of former Gov. Rod Blagojevich .

Emanuel spent three minutes on the stand, remarkably short compared to the 11 hours he spent being grilled in December during a residency hearing as he sought to stay on the ballot. The mayor's demeanor was about the same. He sat up straight and delivered poised and concise answers.

Blagojevich attorney Sheldon Sorosky asked Emanuel if being mayor "is a new job for you?"

"Unless your subscription to the newspapers ended recently, yes," Emanuel responded, a subtle smirk on his face that remained there most of the time.

Emanuel proceeded with a series of simple "yes" or "no" responses to questions, denying knowledge of any wrongdoing or alleged shakedowns.

It was the first time a sitting Chicago mayor has testified in a federal criminal case since Richard J. Daley took the stand at the Chicago Seven trial in 1970.

Emanuel didn't delve into new territory, and his appearance in court may have done little to help Blagojevich 's case.

It also served to remind Chicago voters of the ties the new mayor had with the disgraced ex-governor. But the timing was good for Emanuel -- it came after both the mayoral election and his inauguration. That's because Blagojevich 's retrial was pushed back from January.

Emanuel's testimony provided little clarity on several overarching questions still swirling about what role the former White House chief of staff played in late 2008 as Blagojevich sought to replace Barack Obama in the U.S. Senate after Obama won the presidency.

Emanuel said nobody asked him to set up a nonprofit for Blagojevich to run in exchange for appointing Obama friend Valerie Jarrett to the Senate. Emanuel also said no one asked him to have his brother, Hollywood agent Ari Emanuel, hold a fundraiser for Blagojevich in exchange for release of a $2 million grant that then-U.S. Rep. Emanuel sought for a school in his district.

Prosecutors have charged Blagojevich with both, though they have not claimed Emanuel was aware of the alleged shakedowns. The prosecution did not ask Emanuel any questions.

Left unaddressed were several aspects of the case, from claims by Blagojevich 's legal team that Emanuel would have helped broker a deal to install Attorney General Lisa Madigan in the Senate to why Emanuel relayed a message to the governor that Obama would only "value and appreciate" it if Blagojevich gave Jarrett the post.

Emanuel's testimony was so quick in part because U.S. District Judge James Zagel barred the defense from asking questions about a Dec. 8, 2008, meeting Emanuel had with U.S. Sen. Dick Durbin and Obama political consultant David Axelrod.

After his stint on the stand, Emanuel stepped down, walked briskly down the center aisle and slipped out of the courthouse -- avoiding the media -- before making his way back to City Hall.