The Democratic Party platform  supports and tolerates abortion, as opposed to the Republican Party which wants to restrict most, if not all, abortions. The Democratic Party's platform states that Democrats "believe unequivocally[...] that every woman should be able to access high-quality reproductive health care services, including safe and legal abortion." It states that Democrats "will repeal the Title X domestic gag rule and restore federal funding for Planned Parenthood".  They also "oppose and will fight to overturn federal and state laws that create barriers to reproductive health and rights. We will repeal the Hyde Amendment and protect and codify the right to reproductive freedom." Repealing the Hyde Amendment could have a devastating effect on the lives of many other unborn children as the Hyde Amendment has been credited with saving the lives of more than two million unborn children.  The Democratic Party's platform also states that Democrats will "protect the rights of all people to make personal health care decisions and will reject the Trump Administration’s use of broad exemptions to allow medical providers, employers, and others to discriminate." In other words, doctors and pharmacists who want to follow their conscience and refuse to participate in, or provide medications for abortions, could "discriminate" and such "discrimination" can be prohibited according to what Democrats argue.
In contrast, the Republican Party platform  affirms "that the unborn child has a fundamental right to life which cannot be infringed." Thus, the Republican Party aligns itself with the Church on the issue of the right to life. The Republican Party platform also calls for a constitutional amendment protecting the unborn and "legislation to make clear that the Fourteenth Amendment's protections apply to children before birth." Section 1 of the Fourteenth Amendment states that "[n]o State shall... deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws." Since science, reason, and divine revelation clearly shows that unborn children are persons, then the protections of the Fourteenth Amendment to provide equal protection and due process applies to the unborn, and prohibits the state from permitting their lives to be taken by abortion while the lives of those that are born are protected by the laws and institutions of states. Section 5 of the Fourteenth Amendment states that "Congress shall have power to enforce, by appropriate legislation, the provisions of this article." The Republican Party goes further by calling for defunding Planned Parenthood. In contrast with the Democratic Party's understanding of judges, the Republican Party platform calls for appointment of judges who "respect traditional family values and the sanctity of innocent human life." Such a statement is admirable, to say the least, since it distinguishes between “innocent human life” and “human life” and thereby permits the death penalty, which Church doctrine clearly permits as well.  Other parts of the Republican platform call for the banning of the sale of fetal body parts and tissue, opposing the funding of healthcare with abortion coverage, supporting adoption, funding for ultrasounds, supporting other regulations on abortion such as informed consent, parental consent, waiting periods, clinic regulation, and other regulations. Finally, the Republican Party platform goes beyond abortion and states that they oppose euthanasia, assisted suicide, embryonic stem cell research, and human cloning. All these things are opposed by the Church and are violations of the 5th Commandment which states "thou shalt not kill."
Therefore, the Democratic Party platform supports and tolerates abortion, while the Republican Party wants to restrict most, if not all, abortions; therefore, today, no Catholic should vote for a Democrat for any political office. Some may object to our judgment and say that the Republican Party is no good either, however, Christ the King Law Center (CKLC) has already stated its dissatisfaction with Republicans here and here. Nevertheless, on those issues where we have expressed dissatisfaction with the Republican Party, the Democratic Party is ether no different or, furthermore, even worse. The Democratic Party has no more interest in supporting the Social Reign of Christ the King than does the Republican Party. At least with the Republican Party we can get a government that respects the laws of God with regards to marriage being only between a man and a woman, protection for the lives of the unborn, and greater freedom for the Church. Therefore, in the name of our most High King Jesus Christ we urge Catholics not to vote for the Democratic Party!
 R. Amerio, Iota Unum: A Study of Changes in the Catholic Church in the XXth Century 255 (1996).
 The Democratic Party platform can be found here.
 The so-called "Title X domestic gag rule" is a term that pro-abortion organizations use to describe the federal regulation adopted by the Trump administration in 2019 regarding the federal program called Title X. The federal Title X program gives about $300 million annually in taxpayer funds for "family planning services". However, in 2019 the Trump administration released a rule that prohibited Title X funds from being provided to a program where abortion is a considered a method of family planning. Furthermore, the Trump administration rule removed a requirement that Title X recipients had to provide referrals for abortions and even went further by prohibiting such recipients from referring women for abortions!
 See here: https://www.lifesitenews.com/news/the-hyde-amendment-saved-two-million-babies-from-death.
 The Republican Party platform can be found here. Also, note that this is the platform the Republican National Committee (RNC) adopted in 2016. In 2020 the the RNC refused to adopt a new platform or amend the 2016 platform due to the circumstances surrounding COVID-19 pandemic.
 See here: http://www.lifesitenews.com/news/for-first-time-republican-party-platform-proposes-defunding-planned-parenth.
 See here: http://cklc.weebly.com/blog/can-the-church-ban-capital-punishment.