Just so I'm clear - is it your contention that someone who was elected as a Republican Senator has an obligation to vote for every nominee of a GOP President, upon pain of being a "turncoat"?
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Not at all -- as long as any reason for voting AGAINST the candidate is something other than he/she is a supporter of the Constitution, our system of laws, and believes that judges' jobs are the application of law, not the legislation of it, and are CONSERVATIVE in their views of America.
So, if someone doesn't want Bolton to be UN Ambassador because they think he is an as@#%le who shouldn't be our "ambassador to the world," does that make them a "turncoat"?