You want this here? OK. Sure, a racist could seek to legally marry a woman of the race he is racist against. Not all racism is of the "kill 'em all, I can't stand to be in the same room as 'em!" variety. If you think of members of their race as inferior and of less worth to you, their place being inferior to yours, they might make an excellent spouse, if you expect to be able to treat them as proverbial dirt. It's probably lot easier to practically enslave and sexually assault someone you don't percieve as a human of your own worth in the first place. I'm sure you've encountered people who use their spouse as an object, who have no real connection with him or her, but only see the spouse as a means to some sort of gratification. Indeed, there are people for whom, demeaning their spouse is kind of the point of having one. If you are racist against a group, members of that group could be a perfect fit. I mean, you've never herd of "slumming"?
I'm not suggesting racists marry people from their group(s) of prejudice to have fulfilling and equal partnerships, don't get me wrong.