Donald Trump cuts across a lot of political lines. Sure, the Establishment might like some of his long-held liberal views, but they don't like his immigration talk and his general unpredictability, so they don't want to see him elected.
And there isn't one GOP Elite or Establishment. If you put together corporate executives (many of whom rely on cheap foreign or imported labor), middle of the road GOP campaign consultants, and Movement Conservative journalists (all of whom dislike Trump) it's not like there's one ideology or set of views that unites them. The fact that the reject Trump doesn't mean that they agree about things.
Also, while Trump cuts across existing ideological lines in a big way, so do the other candidates. The idea that somebody's purist candidate would never get support from Establishment or Elite circles (however you want to define them) is naive. There would be a split, but not a complete rejection.
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>> “so they don’t want to see him elected.” <<
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There is zero evidence to support that assertion, and a mountain of free prime face time on all of the networks to refute it.
If they didn’t want him elected, they would treat him just like they treat Cruz.
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