This list of practitioners would be a good place to start: http://www.avvo.com/search/lawyer_search?utf8=%E2%9C%93&q=constitutional+lawyer&loc=austin%2C+texas&commit=
You might want to get in touch with them to find out if they offer a free initial consultation, so if they aren't interested in your case at least it didn't cost you anything. Best of luck
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As a practical matter, you not likely to find an attorney willing to do years of work , hundreds of thousands of dollars of services for free. But you might have some success with advocacy groups sympathetic to your viewpoints.
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