Keep in mind that there are some primaries where voters are not required to register. In TN, for example, we pick one party's primary of the parties with recognized ballot access, but party affiliation is immaterial. This is one reason why I, as a Constitutionalist, look forward to voting for Paul in the TN GOP primary.
That's what I'll be doing as well. It's a shame the party throws up a White Flag of surrender to the Liberals without so much as a fight anymore and pushes candidates they hope will win over DEM liberals. It's not gonna happen. The only major surge of DEM votes the GOP gets is when the GOP runs Conservative. The DEM Conservatives will be happy to cross the party line. Liberal DEMs are not going to vote for the GOP's version of liberal lite. You would think after Bush SR and Dole plus nearly loosing two more POTUS elections they would catch on.