Check out the amicus briefs being filed on Horne's behalf:
http://www.scotusblog.com/case-files/cas...culture-2/
Mar 9 2015 Brief amici curiae of Texas, et al. filed.
(Attorney General of Texas)
Mar 9 2015 Brief amicus curiae of Center for Constitutional Jurispurdence filed.
Mar 9 2015 Brief amici curiae of
Cato Institute, et al. filed.
Mar 9 2015 Brief amici curiae of
DKT Liberty Project, and Thirty-Three Independent Raisin Growers filed.
Mar 9 2015 Brief amicus curiae of Washington Legal Foundation filed.
Mar 9 2015 Brief amicus curiae of
Pacific Legal Foundation filed.
Mar 9 2015 Brief amicus curiae of Mountain States Legal Foundation filed.
Mar 9 2015 Brief amicus curiae of
Chamber of Commerce of the United States of America filed.
Mar 9 2015 Brief amicus curiae of
Institute for Justice filed.
Mar 9 2015 Brief amicus curiae of
Federal Circuit Bar Association filed.
Mar 9 2015 Brief amici curiae of Constitutional and Property Law Scholars filed.
Mar 9 2015 Brief amicus curiae of The Rutherford Institute filed.
Apr 8 2015 Brief amici curiae of
Sun-Maid Growers of California, et al. filed. (Distributed)
CATO and IJ are the cleanup hitters of libertarian prosecution.
The CATO brief is pretty good and was filed jointly with the Reason Foundation, NFIB, Southeastern Legal Foundation, and the Center for Constitutional Jurisprudence.