http://www.supremecourt.gov/opinions/14pdf/14-556_3204.pdf

"There may be an initial inclination to await further legislation, litigation, and debate, but referenda, legislative debates, and grassroots campaigns; studies and other writings; and extensive litigation in state and federal courts have led to an enhanced understanding of the issue. While the Constitution contemplates that democracy is the appropriate process for change, individuals who are harmed need not await legislative action before asserting a fundamental right. "
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