The same argument already applies to the Electoral college. Hillary delegates can vote for anyone they want...but why would they choose anyone else unless between their election as a delegate from a slate of Hillary supporters and their vote she does something so heinous that they’d turn on her. That’s a valid freedom for them to have. Always has been.
Donald Trump's statement:
https://www.donaldjtrump.com/press-releases/federal-court-sides-with-grassroots-activists-rnc-delegates-are-bound-to-fo
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