JFK's predecessor

I think it could be either:

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ike

(Other definitions for ike that I've seen before include "President Eisenhower" , "Nickname for Dwight Eisenhower" , "US general who became president, in short" , "Former US President (informally)" , "Thirty fourth US president's nickname" .)

I've seen this clue in The Mirror, the King Feature Syndicate, The Wall Street Journal and The Star Tribune.

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