Cruz is an ideologue, or at least plays one on TV.
So?
i·de·ol·o·gy
ˌīdēˈäləjē,ˌidēˈäləjē/Submit
noun
1.
a system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
"the ideology of republicanism"
synonyms:
beliefs, ideas, ideals, principles, ethics, morals;