Many of them have NEVER supported Israel. Thought it was asking for trouble back in the day, and don’t support them now. Hell of a lot more Christian support for Israel in the US than there is Jewish.
Of course, some of us consider ourselves Jewish by blood, heritage, and affectional preference, even if no Jewish person would ever acknowledge it.
There is are terms for that, Philo-Semitism, Righteous Gentiles, or Christian Hebraist
I believe Sarah is in touch with her Inner Hebrew (I mean Sarah DOES mean "Princess" in Hebrew, which she lives up to that meaning) and may be an ALL of the above mentioned terms.
I don't understand why Jews (or Catholics for that matter) support Democrats, no other political group in this country could be more opposed to their values.