The reality is, the elections are won or lost by gaining (or losing) the vote of the emotion-driven low-information voter.
Love him or hate him, The Donald can tap into that emotion, whereas Ted Cruz, being an ethical, logical, and highly dedicated patriot, may not be able to. To the low-information voter, frankly, Cruz comes across as downright scary. And in a general election, Herself would trade on that emotional reaction, somehow picturing Cruz as even MORE scary than Herself is.
Sometimes you have to use stupidity against itself.