Here are a list of precedents for the case.
 
Constitution of the Commonwealth of Massachusetts: Article 1 states that all people are equal and have certain natural, essential and unalienable rights. And equality under the law shall not be denied or abridged because of sex, race, color, creed or national origin.

Planned Parenthood v. Casey (1992): The Court's obligation is to define the liberty of all, not to mandate our own moral code.

Commonwealth v. Stowell 389 Mass. 171 (1983): This Massachusetts ruling stated that the regulation of marriage is properly within the scope of the police power.

Loving v. Virginia (1967): Civil marriage is termed a "civil right." The freedom to marry has long been recognized as one of the vital personal rights essential to the orderly pursuit of happiness by free men."

Washington v. Davis (1976): The Surpeme COurt held that a law claimed to be disciminatory must ultimately be traced to a discriminatory purpose.