Republicans who choose not to vote in their party's own primary when that contest is largely predetermined; but to vote in the
Democratic Primary for the purpose of causing the Democrats to be stuck with running an nonviable or badly mauled candidate in the general election. They are "feckless voters" and "fake Democrats" for the primary election who plan to vote for the Republican candidate in the general election. This strategy can backfire if the
Republicans choose the "wrong" candidate in their primary, and the Democrats can use the same strategy in reverse to produce a nonviable Republican candidate for the General Election.