Several Colorado municipalities passed ordinances banning discrimination based on sexual orientation in housing, employment, education, public accommodations, health and welfare services, and other transactions and activities. In response to these ordinances, Colorado voters passed Amendment 2, which prohibited all governmental intervention designed to protect the status of persons based on their sexual orientation, conduct, practices, or relationships. Evans (plaintiff) represented a class of aggrieved homosexual persons and municipalities in Colorado and brought suit in Colorado state court against Roy Romer (defendant), the Governor of Colorado, on the grounds that Amendment 2 was unconstitutional. The trial court enjoined enforcement of Amendment 2. The Colorado Supreme Court affirmed, and the United States Supreme Court granted certiorari.