"The ideas of the ruling class are in every epoch the ruling ideas, i.e. the class which is the ruling material force of society, is at the same time its ruling intellectual force. The class which has the means of material production at its disposal, has control at the same time over the means of mental production, so that thereby, generally speaking, the ideas of those who lack the means of mental production are subject to it. The ruling ideas are nothing more than the ideal expression of the dominant material relationships, the dominant material relationships grasped as ideas." (From "The German Ideology," 1845)

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U.S. President Barack Obama stands next to Reuters Editor-in-Chief Steve Adler and White House Correspondents Association President and Reuters correspondent Caren Bohan as he attends the White House Correspondents Association annual dinner in Washington, in April 2012.