Possibly true, in many cases, but the fact remains that these were promises that got them elected. That doesn't mean the polices should actually be enacted, or course.
The point about Rommey is that when a centre-right Republican moved to the Right he moved the Republican party to the Right with him. If Bernie moves the Dems to the Left it will leave a hole in the middle of US politics large enough that a new party might need to emerge to fill it.
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