President Obama announced a shake-up of his top White House personnel on Friday, naming deputy national security adviser Denis McDonough as new chief of staff and saying good-bye to longtime senior adviser David Plouffe, a key architect of his political strategy.

Obama promoted McDonough, one of his most trusted and loyal deputies, to oversee White House operations as the administration tackles its major second-term legislative initiatives, including gun control measures, immigration reform and tax and budget issues.

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