I wouldn’t care to see the psychological profile of his more rabid aggressive supporters! :)
But seriesly, I’m sure Cruz offers an opt-in for gathering such info, and most of his fans would trust him enough to share it with his campaign.
In other words, this is a yet another cheap shot by the wapo against someone on our side.
They would probably turn out a lot better than those of the folks keening ecstatically about the "Trump of God" and writing hymns to Donald in all caps.
I think they live on Crimson Peak.