Unless there's a pile of money in it for his mother, she will ruin his chances with some pitiful story of how he victimized her, didn't call home, loved his father more than her, married someone she didn't like, etc. etc.
Being raised by Meghan and Harry, Archie may be so messed up and out of touch with ordinary people that he would not be able to get many votes...and by then having a smidgen of African ancestry won’t be a big deal for a Presidential candidate.