Register as a Republican in the primaries and vote conservative. If a RINO gets nominated, vote Democrat in the General Election. If it happens too often, start a third political party.
My own feelings are the conservatives in the Republican Party should really get out if they can;t squeeze the RINOs like Whitman et al out of it. It will be difficult as the Whitmans and other RINOs are limousine liberals with lots of bucks. Their only in the Republican Party is to have a political organ which opposes any taxes which might threaten their personal wealth. But the NUMBER of these RINOS is far exceeded by rank file social and fiscal conservatives. Its only the money of the RINOs which gets them influence in th GOP and that is what makes it difficult to flush them out.
With a new political party, it owuld be easier to set ground rules for the party platform and make it clear from the beginning it is not a place for those people. Eventually they will gravitate over to the Dems where they belong and use their money to swing it further to the center.
I live in Illinois, and, in this state, we don’t register by party.
If Republicans think that their party is too liberal, they shouldn’t form a new party, they should join the Constitution Party.