Probably easier to primary them and take over the party but it would require complete removal of many in the party from Romneys niece leading the RNC all the way down to the local level of who picks, supports, and funds the candidates. For me we were stuck with RINO Peter King who just passed the torch to some local party guys son who looks like a real ball less do nothing. Third party would be the way but I,m sure the laws would make it very difficult