Which Catholic church has not predictably voted for and self-identified with Democrat candidates?
Individuals may but the Church itself does not.
I assume that you can do simple Math. The Catholic Church in the U.S. represents about 5% of the Catholic worldwide population. Whatever American Catholics think in terms of Polls, or how they vote is “not relevant” to what the Catholic Church teaches “definitively” on Faith and Morals.
We have had legalized abortion in this country since 1973, euthansia is being pushed by many U.S. States, it is legal in some countries, re-defining marriage is an ongoing battle and unfortunately, many U.S. Catholics have wed themselves to the “spirit of the age” [to borrow from G.K. Chesterton] but the Catholic Church in union with the Pope, guided by the Holy Spirit, as not wavered on her teachings and will not.
Whether you admit it or not, Protestantism, with its elevation of each person and his or her Bible as the sole determiner of Truth can not sustain itself, what will happen as groups democratically align themselves together to vote on “stances to take” with regards to moral questions, Protestantism will continue to fragment at the confessional level to more and more different groups.
While there are many dissenting Catholics in this country, that is precisely the point, they are “defacto heretics” in that they are rejecting revealed Truths of the Catholic Church.
Too much of Protestantism and its Individualism, i.e. Me and my Bible and personal relationship with Jesus is in reality me and my Bible and a relationship with his or her on theology which in the end is a relationship with one’s on mind. Yes, there are many good Christian people in many of the various protestant ecclesial communities but that does not change the fact that Protestant ecclesiology, basec on its own principles, will always be subject to democratic forces among its believers who can vote on their own pastor, and its own theological beliefs.