Like all Cruz supporters they think if they can just get their man the Republican nomination that he will win the General Election.
Problem is he is hated by liberals, blacks don't gravitate to him. Hispanics do not even consider him one of them, and even women are starting to move away from him.
Delusion drives clouded thinking.
This... entirely describes the fix your man is in. Have you looked at any survey data at all?
Talk about delusion...
However, some liberals would indeed gravitate to Trump, given his on-again, off-again liberal stances.