The guy at your local coffee shop who's never left the state but speaks as though he's lived in London all his life? His British accent is an affectation.
Never confuse affectation with affection — which means “love” or “tenderness.” While affection might not always be genuine, affectation is never the real thing. In fact, affectation is all about faking it. Do you believe the politician cares about poor people, or do you think his concern is an affectation?