Hmm, Romney lost and Nixon came out on top though.
https://en.m.wikipedia.org/wiki/Republican_Party_presidential_primaries,_1968I guess Romney blew it and put Nixon in front, but was Reagan really right not to criticise Nixon?
Nixon was the front-runner for the Republican nomination and to a great extent the story of the Republican primary campaign and nomination is the story of one Nixon opponent after another entering the race and then dropping out.
Nixon's first challenger was Michigan Governor George W. Romney. A Gallup poll in mid-1967 showed Nixon with 39%, followed by Romney with 25%. However, in a slip of the tongue, Romney told a news reporter that he had been "brainwashed" by the military and the diplomatic corps into supporting the Vietnam War; the remark led to weeks of ridicule in the national news media. As the year 1968 opened, Romney was opposed to further American intervention in Vietnam and had decided to run as the Republican version of Eugene McCarthy (New York Times 2/18/1968). Romney's support faded slowly, and he withdrew from the race on February 28, 1968. (New York Times 2/29/1968).
I'd say that both Romney and Reagan should have taken a stand and said that the presidential candidate and the vice presidential candidates weren't right.