By Carla HintonStaff writer chinton@oklahoman.comFor months, Christina Kirk, Ph.D., had been planning a trip to Washington, D.C., to attend the inauguration of Kamala Harris as the nation's first Black female vice president. Kirk, 43, was especially thrilled because she and Harris are sorority sisters — both members of the Black Greek sorority Alpha Kappa Alpha Inc. "I received an AKA suitcase for my birthday last month.