Regarding voting for Catholic principles, the Official 2016 DEMOCRATIC Party Platform specifically supports abortion, supports funding of abortions, and it supports the United Nations (which openly attacks church teaching, and which spreads abortion throughout the world through funding).  
The Official 2016 REPUBLICAN Party Platform, on the other hand, specifically supports the life of the unborn child, opposes funding for abortion, will strike down any edicts to the states regarding the new bathroom issues, will fight for school choice, believes that the Bill of Rights protects the people's rights to PRACTICE THEIR FAITH, supports the right of business owners to conduct business according to their religious beliefs, and opposes the adoption of treaties that would weaken American sovereignty.
According to Pope John Paul II's Evangelium Vitae, abortion is an intrinsic evil and must never be promoted by the law.