The existence of race, or at least the moderately clear delineation between races, is proof that the majority of us are hopelessly racist, and racist where it counts the most. It is one thing to prefer members of your own race when it comes to hiring people, but quite another with far greater impact for racial preferences to come into play when it comes to choosing that special someone to share those lifelong commitments of marriage and raising a family.
If we were all or even mostly all truly colorblind when it comes to love, I would expect that statistically we would see far, far more interracial marriages than we do. Therefore, in the equations of love, race clearly plays a significant role.
Clearly this is wrong, immoral, and a detriment to society. What possible reason is there to give preference to members of your race? All races are equally beautiful, intelligent, compassionate, etc., so there is no possible rational reason to marry someone of your own race.
Since the government already administers affirmative action for employment and education, and since marriage is a legal institution created and supported by the government, and since this proven racism in regards to marriage is clearly irrational and wrong, and since the government has and does get to decide who can marry (gays cannot, siblings cannot, interracial marriage was once illegal but is now legal, etc.) the government has a right - nay a duty! - to correct this egregious wrong.
The solution is obvious. When social security cards are issued, race identifiers are added to the card (and social security database) with the proportion of cards getting marked with each race the same as the proportion of that race in the general population. Then you are legally limited to marry only those people who have the race identified on your social security card.
Then, in a few generations, the problem will be completely solved and we'll have a pleasing continuum of skin color.