"The demands of the job are such that you're not going to do it for very long if there's not great satisfaction," Ornstein said.
The White House's last shakeup took place a year ago, when Daley was brought in to succeed Rahm Emanuel. In a flurry of moves, Obama also replaced outgoing senior advisor David Axelrod with David Plouffe, who had managed Obama's 2008 campaign. Axelrod returned to Chicago to work on Obama's reelection campaign.
Lew's arrival will be welcome on Capitol Hill, especially among Democrats who were frustrated by Daley's unfamiliarity with Congress. Lew was a senior policy advisor to former House Speaker Tip O'Neill. He also served as budget director under President Clinton, and as deputy director of the State Department under Hillary Rodham Clinton before taking the budget job.
Rep. Nancy Pelosi (D-San Francisco), the minority leader, called Lew "a proven leader."
After Obama announced Daley's resignation, Senate Majority Leader Harry Reid (D-Nev.) said in a statement: "I wish Bill well in his future plans, and look forward to a close collaboration with Jack Lew and his staff."