Well, you be thinking wrong then. Polls have shown that up to 20% of the democrat vote may go for Trump. He is popular across all demographic spectrums. The problem with being a Cruz supporter is you have to defend the illusion that Cruz is even relevant...which he is not in terms of being able to beat Trump. BTW, Reuters five day rolling poll has Trump at 50% and Cruz at 21%...Trump is surging and Cruz is peaked it looks like. Also, Economist poll came out last week. Trump moved from 44% support in February to 53% in March!
Do you realize you are actually talking about preventing people from joining the Republican party by going closed? Or, preventing supporting the front running Republican by candidate by democrats who are disillusioned with their party and independents who are sick of this government corruption. To win, which Cruz still would not, you advocate limiting people from joining our side...that is sick.
If they are disillusioned the can go through the process of changing parties to the republican, last time I checked there was no money involved in doing this, and no law against it either.
FL has a closed to party primary. Democrats vote for democrats, and Repubs for Repubs... no open primary. Not allowing the opposition, in either case to decide a candidate, the media notwithstanding. Much more sensible than the stupid SC “primary” and other states. People switch parties because of this and it is a truer measure of the “bleed over” vote... as it clearly showed with the Reagan democrats in FL at the time.