Have you heard? Comedienne Tina Fey has played lady candidate Sarah Palin on the tee-vee! Twice! So completely has Fey-as-Palin penetrated the pop culture landscape that Barack Obama found himself on Entertainment Tonight, grilled by Mary Hart not on the economic collapse but on the one issue most important to voters: what does he think of Fey's Palin impression? Obama notes the resemblance is "remarkable" and even heaps praise on Saturday Night Live player Fred Armisen's Obama performance — at which point vice presidential candidate Joe Biden pipes up to remind America that he, too, was impersonated on SNL once!

What, you don't remember? We've got SNL's Biden impression cued up after the jump:

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