No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State 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.
This was intepreteted in Roe to mean abortion bans are OK in the 1st trimester, conditional in the 2nd, and prohibited in the 3rd trimester.
Loving took this and said that means interracial couples and gays get equal legal protection and treatment to everyone else.