She was called the performer who had the greatest impact on culture and entertainment in 2008 by the Associated Press . They gave her their AP Entertainer of the Year award . She was singled out as the performer who had the greatest impact on culture and entertainment in 2008 by the Associated Press , which gave her its AP Entertainer of the Year award for her satirical portrayal of Republican vice presidential candidate Sarah Palin in a guest appearance on SNL .