"The right to marry is a fundamental right inherent in the liberty of the person, and under the Due Process and Equal Protection Clauses of the Fourteenth Amendment couples of the same-sex may not be deprived of that right and that liberty. Same-sex couples may exercise the fundamental right to marry."

 

http://www.huffingtonpost.com/2015/06/26/supreme-court-gay-marriage_n_7470036.html

 

http://www.supremecourt.gov/opinions/14pdf/14-556_3204.pdf