I am still astonished that any supposedly sane person would want to outlaw “interracial marriage.” It cannot even be an arguable position until you find some unambiguous legal way to determine what race anyone belongs to, outside of their own say-so. Any scientific attempt to outlaw miscegenation will invariably void a significant fraction of supposedly lily-white marriages.

Biologically, race has very little meaning, at best exhibiting changes in allele frequency. There are notable exceptions, of course, such as the genes non-Africans inherited from their Neandertal ancestors, but not all whites have those, and in the USA many african-americans do.