As Republicans arrive in Milwaukee to nominate Donald Trump, the convention comes on the 60th anniversary of an important warning from New York Governor Nelson Rockefeller at the party’s 1964 gathering in San Francisco: “There is no place in this Republican Party for those who would infiltrate its ranks, distort its aims, and convert it into a cloak of apparent respectability for a dangerous extremism.” [time-brightcove not-tgx=”true”] Republican convention goers in 1964 — including many new activists on the right who had earned coveted delegate spots by working around the party’s moderate leadership and winning support at the grassroots — were there to nominate the conservative Arizona Senator Barry Goldwater.