Obama to Give Up Senate Seat on Sunday ... Who Will Fill It?

It seems strange, but technically, Barack Obama is still a sitting senator. In fact, in an odd twist, when Congress reconvenes for a lame-duck session, Obama and Joe Biden can still vote on legislation while working on their transition in a competing branch of government.

Obama has indicated that he's not quite comfortable with this arrangement, which seems to touch on some serious separation-of-powers issues. With that in mind, Obama will officially give up his Senate seat on Sunday. Subscription-only Roll Call reported:

"It has been one of the highest honors and privileges of my life to have served the people of Illinois in the United States Senate," Obama said in a statement on Thursday. "In a state that represents the crossroads of a nation, I have met so many men and women who've taken different journeys, but hold common hopes for their children's future. It is these Illinois families and their stories that will stay with me as I leave the United States Senate and begin the hard task of fulfilling the simple hopes and common dreams of all Americans as our nation's next President."