Republicans 1968, maps of primaries and convention vote
Primary map (top) only shows primaries, not caucuses or other delegate-selection contests. Convention map based on which candidate got the plurality of votes from each state on the first ballot, before switching. Information from Congressional Quarterly publications.
In 1968, Nixon was back and the Republican party was ready to reconsider him after their 1964 disaster. Romney had been an early front-runner but he withdrew before the New Hampshire primary because of continuing troubles over a remark that the military had “brainwashed” him into supporting the Vietnam war. Rockefeller was still a champion of the liberal wing of the party even after his defeat in 1964 by Goldwater; Reagan with his base in California took up the conservative cause; Rhodes was the “favorite-son” from Ohio. But none could slow down Nixon’s march to victory at the convention--in part because ideological opposites Reagan and Rockefeller could not coordinate any kind of stop-Nixon strategy. Although Goldwater had been crushed in 1964 after bringing the GOP to the right, the Republican party saw an opening with the repeated breakaway of the socially conservative Christian-segregationist voters from the Democratic party (which would be encouraged again in 1968, this time by Wallace running as a third-party candidate) and Nixon was able to maneuver well enough to defeat both Humphrey and Wallace.
Schedule of 1968 primaries from Congressional Quarterly’s Presidential Elections, 1789-1996
March 12: New Hampshire
April 2: Wisconsin
April 23: Pennsylvania
April 30: Massachusetts
May 7: DC, Indiana, Ohio
May 14: Nebraska, West Virginia
May 28: Florida, Oregon
June 4: California, New Jersey, South Dakota
June 11: Illinois
Classic races for the nomination, pre-1972, depicted in maps
Primaries and caucuses 1972 and afterwards