I would venture the opinion that all presidential candidates honestly intend to "defend the country against all enemies, foreign and domestic."

The critical difference lies in who one perceives as an enemy, and how readily one would proceed to engage in "defense."

There are misguided individuals who might consider me to be a domestic enemy of the country. I hope none of them get elected and decide to kill me. I'm an opponent of many powerful individuals who have claimed to speak and act on behalf of the US, but I'm nobody's "enemy," and I love the American people and the American countryside regardless of who's running the government.