The Dennis Hollingsworth v. Kristin M. Perry case in 2009 was a significant landmark in the fight for same-sex marriage rights in the United States. The case revolved around Proposition 8, a California ballot proposition and state constitutional amendment passed in November 2008 that banned same-sex marriages. The plaintiffs, two same-sex couples who were denied marriage licenses due to Proposition 8, argued that it violated their Fourteenth Amendment rights to equal protection under the law and due process of law. In August 2010, Judge Vaughn Walker ruled that Proposition 8 was unconstitutional under both Due Process and Equal Protection Clauses of the Constitution; however, this decision was appealed by supporters of Propostion-8 led by Dennis Hollingsworth as they claimed standing as initiators of Prop-8 after Governor Schwarzenegger refused to appeal it further . This eventually led to an appeal at Supreme Court where court held that private parties do not have "standing" to defend California's voter-approved ballot measure barring gay and lesbians couples from state-sanctioned wedlock when state officials refuse to do so thus upholding lower court ruling effectively making Same-Sex Marriage legal again.

In the dissenting opinion for Dennis Hollingsworth, et al. v. Kristin M. Perry et al., 2009, it was argued that the majority's decision to overturn Proposition 8 - a California ballot proposition and state constitutional amendment passed in November 2008 which stated that "only marriage between a man and a woman is valid or recognized in California" - undermined democracy by invalidating the votes of seven million Californians who supported the measure. The dissenters believed that this case should not have been about whether same-sex marriage is good or bad policy but rather about respecting democratic processes; they felt it was an overreach of judicial power to invalidate legislation enacted by voters without clear constitutional grounds for doing so. They also expressed concern about potential implications on religious freedom as institutions with traditional views on marriage could face legal challenges following this ruling.