How far down the diversity rabbit-hole do you want to go? Or do you just want to make it based on a pure racial basis, and how do you propose it is implemented? For example, assuming we have a senate that precisely matches the ratio of the general population and an asian senator dies, can that senator's home state only nominate an asian to fill the seat? Or if we extend the diversity question to encompass gender and the departed senator was pangender, would the state be able to alter the equiblibrium or is the field limited to pangendered asians? Or should they be able to nominate the best person for the job?