How Obama won?

How Obama won the presidential election? You should tell me the exact reasons or the correct strategies that sent him to the White House.

Newspapers attribute several people's hard work for his success and they have singled out Anita Dunn, the veteran political consultant who oversaw the ‘war room’ of the political campaign, using combine message, research and policy.
Anita Dunn

I would personally agree with this view though the work of others such as David Axelrod who was the campaign mastermind. The journalist turned-political consultant shaped Obama’s message of hope and stood by it even when Obama slipped in the polls.

David Axelrod

After reading several newspapers and articles online, the following solid reasons for Obama's win seem to be appropriate.

* His favorable outlook for the middle class Americans

* His promise of ending the recession

* His economic view of cutting down the offshore outsourcing

Of course, above all, we really can't rule out the change in the White House expected by the citizens of the U.S.