Tonight HBO will broadcast “The Loving Story,” a documentary about Richard and Mildred Loving, the interracial couple whose marriage was banned by the state of Virginia and ultimately upheld by the Supreme Court in 1967.

Mildred Jeter, a black woman (though she also had Native American heritage and may have preferred to think of herself as Indian), married Richard Loving, a white man, in the District of Columbia in 1958. When they returned to their home in Caroline County, Virginia, they were arrested under Virginia’s anti-miscegenation statute, which dated to colonial times and had been reaffirmed in the Racial Integrity Act of 1924. The Lovings were indicted and pled guilty. They were sentenced to a year in jail; the state’s law didn’t just ban interracial marriage, it made such marriage a criminal offense. However, the trial judge suspended the sentence on the condition that they leave Virginia and not return together for 25 years. In his opinion, the judge stated:

Almighty God created the races white, black, yellow, malay, and red, and he placed them on separate continents. And but for the interference with his arrangement there would be no cause for such marriages. The fact that he separated the races shows that he did not intend for the races to mix.

Five years later they filed suit to have their conviction overturned. The case eventually reached the Supreme Court, which struck down Virginia’s law unanimously. Chief Justice Earl Warren wrote for the court,

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. Marriage is one of the “basic civil rights of man,” fundamental to our very existence and survival.

Here’s how ABC News reported the case on June 12, 1967:

Some people, of course, see parallels between Virginia’s ban on interracial marriage and its current ban (along with many other states) on same-sex marriage. One of them is Robert A. Levy, chairman of the Cato Institute. Joined by John Podesta, with whom he co-chairs the advisory committee of the American Foundation for Equal Rights, the nonprofit group that brought the Perry case against California’s Proposition 8, he wrote in the Washington Post in 2010:

Now, 43 years after Loving, the courts are once again grappling with denial of equal marriage rights — this time to gay couples. We believe that a society respectful of individual liberty must end this unequal treatment under the law….

Over more than two centuries, minorities in America have gradually experienced greater freedom and been subjected to fewer discriminatory laws. But that process unfolded with great difficulty.

As the country evolved, the meaning of one small word — “all” — has evolved as well. Our nation’s Founders reaffirmed in the Declaration of Independence the self-evident truth that “all Men are created equal,” and our Pledge of Allegiance concludes with the simple and definitive words “liberty and justice for all.” Still, we have struggled mightily since our independence, often through our courts, to ensure that liberty and justice is truly available to all Americans.

Thanks to the genius of our Framers, who separated power among three branches of government, our courts have been able to take the lead — standing up to enforce equal protection, as demanded by the Constitution — even when the executive and legislative branches, and often the public as well, were unwilling to confront wrongful discrimination.

But tonight you don’t have to worry about contemporary issues. Just enjoy “The Loving Story,” a story about two people who loved each other and whose marriage eventually led to an advance for the American principle of equal liberty under the law.