A half-forgotten exchange of letters between two titans of the Republican party, Dwight Eisenhower and Ronald Reagan, contains an urgent lesson for the presidential candidates who will debate at the Reagan Library on Wednesday: Tell the country that you will be the president of all Americans, and will represent no one group in particular.

This message-in-a-bottle from Ike and the Gipper comes straight from the 1960s, but it holds important lessons for our own time. 

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