Ok, then. Vote for Cruz or whoever. Once the primary is done, and a Republican candidate is selected, I'm going to vote for him, no matter what. Four more years with a Dem administration is not survivable.
And if in 2016, the Republican is a weak sister who compromises into being a functional Democrat, as in the past two (at least!) presidential races, then your vote will probably represent a minority, and so your candidate will probably lose, and the Democrat will win by default and fraud.
"We won't survive another four years of [insert Democrat here]" may someday have merit, but for the past 30-odd years I've been hearing it, it has always failed. Fear is a bad voting guide.