Sounds like you need to start a Pro-Greek Campaign on your campus. Enlighten the campus and the student government what you all have done. Don't throw it down their throats like "HERE WE ARE...GOTTA LOVE US." Instead go to their meetings, take note of what they think, get Greeks to run for offices more often, and perhaps start getting your accomplishments published more.
I came from a commuter campus but our Student Government was primarily made up of Greeks. Why? Because we cared and because so many of those over achievers just happened to be in GLO's (including myself and MANY of my sisters)!
It's hard enough to have the faculty against Greeks, but to have other students including your own government against you is worse. Try to build those bridges and perhaps in your Panhellenic/IFC groups create a board to take the initiative! This is your chance to bond together as Greeks!
GO FOR IT!
Hootie