While there is still no official office space or anything, according to the WP Barack Obama's 2012 campaign team is starting to build a foundation and should be "a functioning legal entity" in a month:
He has rebuilt his White House around his new chief of staff, Bill Daley, and his 2008 campaign manager, David Plouffe, with Vice President Biden continuing to play a central role.
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The next piece to fall into place will be the campaign operation. The Chicago-based reelection team will be under the direction of campaign manager Jim Messina, who recently stepped down as White House deputy chief of staff. David Axelrod, who has returned to Chicago after two years as senior adviser to the president, will again play the central role he did four years ago.
In due course, the Obama campaign operation will be fully staffed and humming. At this point, it has studied the reelection campaigns of previous presidents. The campaign advisers understand their challenges and have ideas about how to deal with them.