If persons of whatever party or persuasion want to declare their opposition or support of abortion for moral or religious reasons, okay, that's their business. But don't let it make a difference to your politics or theirs. Please!
America is a democratic Republic governed by laws that were adopted through the political process under the Constitution as interpreted by the Supreme Court for our time and place. Our constitution protects freedom for and from religion. Religion in America is a private right guaranteed by the Constitution. Private individuals, when they enter the political arena, are public citizens. Through private individuals religion can influence, but not substitute for the body politic which rests on the consent of the governed, not on any religious doctrine, book, or law.
Abortion, like surgery or any physical intervention, is an act of violence. Violence should be prevented in a just moral and political order. We have laws against violence, i.e. against kidnapping, slavery, and murder, the killing of human persons. However, violence, while not justafiable, may sometimes be necessary. And so, we have exceptions to the laws against violence: self-defense, defense against violence against others, defense of the Republic from enemies, and the defense of all human life and, in some societies, of all life when unnecessary.
The moral principle is that violence can be exerted only when necessary. Who decides when it is necessary in surgery, the patient (hopefully in consultation with loved ones and medical experts). In self defense or defense of others, the person or persons threatened. Abortion is a violation. It should not be done except when necessary. Who decides? The pregnant woman, of course.
But you say: the pregnant woman cannot abort a fetus because it is a human life. Who says so? Not the law, not many citizens, not science, not even many religions. But your religion says that the fetus is a human life because God has infused a soul at the moment of conception. Or because it on its way to become a human being. Okay, you can believe that and the law will protect you in your belief. You do not have to have an abortion even if bearing the child will kill you. You have the right to give or not to give birth for whatever reason. And if you decide to have or not have an abortion, the law will protect you in your belief. But you do not have the right to force that belief on others.
Only after the child is born, when the organism is no longer a dependent fetus, but an infant in interaction with others in the world, does the law recognize the infant as a human being under full protection of the law.
Therefore, traditional Catholics, Bishops and preachers, Bible thumpers, preach in your churches and mosques against having abortion. But take abortion out of the political realm. Keep it out of political platforms, campaign speeches, civil law. It is a private, personal, moral decision by the pregnant person. And never, never vote or promote a vote for or against a candidate because of his/her religious belief--unless that candidate threatens the political right of a pregnant woman to make a personal, religious, or moral choice.
This is not to say that I personally support abortion. I do not. I generally reject violence. But I believe that violence can be mitigated most by taking away all the conditions that necessitate violence. Do you want to lessen the number of abortions? Then make sure that financial support, personal growth, education, medical care, and the ongoing care of the child are not factors in the decision-making by the woman bearing the fetus. Those definitely are political issues that will free people to make proper decisions including the decision to or not to have an abortion. Despite the bumper stickers, pro-choice is pro-life.