If you are unfamilar with Sara Benincasa and her impressions of Sarah Palin, I urge you to immediately educate yourself. She is brilliant and spot on. Her impressions are different from Tina Fey's in that they let us see into Sarah Palin's psyche.
Pull up a chair and get comfy. I warn you, however, you may laugh so hard you injure yourself. It'll be worth it, I assure you.