On Tuesday, the Supreme Court hears arguments on same-sex marriage, which is now legal in about three dozen states.

But it's also legal in most states to discriminate against lesbian, gay, bisexual and transgender — LGBT — people in the areas of employment, housing and public accommodation.

So in many states, a person could marry someone of the same gender and then get fired for being gay.

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"Most states have no nondiscrimination protections for LGBT people," says David Stacy, government affairs director for the Human Rights Campaign, a national gay-rights group. "With limited or no federal protections, an LGBT person can get legally married in most states, but then be evicted from an apartment and denied a home loan."

Gay-rights activists are urging state lawmakers to change anti-discrimination laws — which already include things such as race, age, religion and disability — to include LGBT people.

Religious groups opposed to gay marriage argue that the public accommodation element would unfairly require business owners to serve same-sex couples, even if they have a moral or religious objection.

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