Found it.
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FNC: Mamma Mia! John McCain the Dancing Queen?
https://www.wikileaks.org/podesta-emails/emailid/1813
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22Q) ISAACSON:: You were asked to name your top 10 songs. And #1 was
ABBA's "Dancing Queen"?
https://www.wikileaks.org/podesta-emails/emailid/1026