'The Right' is an awful big tent, and (thinking about it) includes a lot of disillusioned/failed/exiled leftists. It's not surprising that there are a lot of leftist ideological points represented in that plurality ex-leftists who find themselves 'on the right'/'thrown in the pit with the rest of us' when the Overton Window slides left (again and again.)

Given the ideological scattering of anti-leftists, and the fractured nature of the right, is there even any way to stop this kind of ideological pollution? Can we even purity test when the only definition of Conservative or Rightist is relative to to the sliding of the Overton Window?