A little more on Romer v. Evans:
Facts of the case
Colorado voters adopted Amendment 2 to their State Constitution precluding any judicial, legislative, or executive action designed to protect persons from discrimination based on their "homosexual, lesbian, or bisexual orientation, conduct, practices or relationships." Following a legal challenge by homosexual and other aggrieved parties, the state trial court entered a permanent injunction enjoining Amendment 2's enforcement. The Colorado Supreme Court affirmed on appeal.
Question
Does Amendment 2 of Colorado's State Constitution, forbidding the extension of official protections to those who suffer discrimination due to their sexual orientation, violate the Fourteenth Amendment's Equal Protection Clause?
Conclusion
6–3 decision
majority opinion by Anthony M. Kennedy
Yes. In a 6-to-3 decision, the Court held that Amendment 2 of the Colorado State Constitution violated the equal protection clause. Amendment 2 singled out homosexual and bisexual persons, imposing on them a broad disability by denying them the right to seek and receive specific legal protection from discrimination. In his opinion for the Court, Justice Anthony Kennedy noted that oftentimes a law will be sustained under the equal protection clause, even if it seems to disadvantage a specific group, so long as it can be shown to "advance a legitimate government interest." Amendment 2, by depriving persons of equal protection under the law due to their sexual orientation failed to advance such a legitimate interest. Justice Kennedy concluded: "If the constitutional conception of 'equal protection of the laws' means anything, it must at the very least mean that a bare desire to harm a politically unpopular group cannot constitute a legitimate governmental interest."