President Barack Obama challenged the nation's vested interests to a legislative duel Saturday, saying he will fight to change health care, energy and education in dramatic ways that will upset the status quo.

'The system we have now might work for the powerful and well-connected interests that have run Washington for far too long,' Obama said in his weekly radio and video address. 'But I don't. I work for the American people.'

He said his ambitious budget plan, unveiled Thursday, will help millions of Americans, but only if Congress overcomes resistance from deep-pocket lobbies.