I can't do impersonations... but my husband does an amazing Ronald Reagan.
The first time I heard it was at a sorority fundraiser that I'd dragged him to. They had a political-impersonations contest, and he got up and said: "Well, Nancy and I... we're just so proud to be Americans... I can't remember the last time I felt this proud to be an American... in fact, I can't remember much of anything these days..."
What made it better (worse?) is that the sorority in question was Sigma Kappa, part of whose philanthropy work is Alzheimer's research... and my husband had NO CLUE until I told him afterwards
(He won.)
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