Politico is ill-informed. He is attacking RINOs, not Republicans. Eric Cantor is a liberal phony and must be primaried and defeated.
It's "conservatives", limited-government types that the Republican party doesn't like or want. (Remember NY-23.)
Remember also the 2012 RNC and its rule-changes, the primaries and their dirty/illegitimate manipulations, the flat-out arrogance that "republicans" must vote for the anointed candidate?