The Cause for Including Gender Identity and Expression in Non-discrimination Policies

Florida Atlantic University students have created a petition seeking gay and transgendered protections.
http://www.sun-sentinel.com/news/local/palmbeach/sfl-fau-gay-discrimination-p042209,0,1517824.story

More than 230 colleges and universities in the United States include "Gender Identity and Expression" as a part of their non-discrimination policies. The University of Central Florida does not.

The common argument is that this protection is "unneccesary" as these policies include "sex or gender" as a part of protected classes.

Is this enough?