You need to learn to look at a RINO like Snowe or Specter as a place holder until more conservative candidates can be elected.
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I think that's a very critical point that needs repeated often.
Can you identify elections where a RINO politician has helped with the election of an immediate successor who was conservative? I can't think of any around Illinois, but perhaps it happens elsewhere.
My experience is that RINOs sabotage conservatives because if conservatism were really allowed to take hold the RINOs would have no reason to exist. Many RINOs are seen as hypocrites on many issues, because they are; conservatives and conservatism then suffer guilt by association.