LAS VEGAS (AP) — A national gay rights advocacy group is suing Nevada's governor in federal court in a bid to win marriage rights for same-sex couples in the state.A lawsuit filed Tuesday in Las Vegas by Lambda Legal Defense and Education Fund claims eight "committed same-sex couples" are being discriminated against because they aren't allowed to marry.The civil lawsuit names Republican Gov. Brian Sandoval and seeks to strike what it terms "an alternative status" established by the state's 2009 domestic partnership law and "the state's selective bar to access to marriage."The lead plaintiffs are 73-year-old Beverly Sevcik and 76-year-old Mary Baranovich of Carson City.An aide to State Attorney General Catherine Cortez Masto says the state will review the filings and decide how to proceed.