Race relations

Saw this tidbit in the NYTimes recently:

Members of the House have their own elevators, too, but senators are fewer in number, are more recognizable and tend toward a tall aristocratic archetype. House members blend more seamlessly with the masses and are harder to recognize, which creates its own problems. (Congressional staff members related an incident in 2001, in which they recalled the freshman Representative Melissa Hart of Pennsylvania, who is white, admonishing Representative Julia Carson, who is black, that the elevator they were riding on was members-only. Ms. Carson, of Indiana, proceeded to introduce herself to her new colleague, offense taken.)

Hmmmm…  Representative Melissa Hart, Representative Julia Carson.  Wonder what bit of identification they left out of this little exchange?