High Quality Content by WIKIPEDIA articles! The 1964 Republican presidential primaries were the selection process by which voters of the Republican Party chose its nominee for President of the United States in the 1964 U.S. presidential election. Senator Barry Goldwater was selected as the nominee through a series of primary elections and caucuses culminating in the 1964 Republican National Convention held from July 13 to July 16, 1964 in San Francisco, California.