Although i do understand the idea of id rather have a liberal democrat in office than a liberal republican
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I dont...
the republican party is supposed to be the conservative party. without republicans being conservative, the tea party would have little voice, because their candidates would win if they were a third party candidate (hence we have no “Libertarian Party USA” pols in federal office). To preserve that, Republicans have to preserve their conservative voice, meaning cut out, however painful, those “moderates” or liberals who call themselves Republicans, but are truly not.
A liberal republican can do as much damage as a liberal democrate, plus they stink up the brand name. So a liberal republican is marginally worse.