"It will become effective in Mississippi, and circuit clerks will be required to issue same-sex marriage licenses" when the stay is lifted, Hood said.
"This could come quickly or may take several days," he said. "The 5th Circuit might also choose not to lift the stay and instead issue [an] order, which could take considerably longer before it becomes effective."
Gov. Phil Bryant, a Republican, said the Supreme Court "has mandated that states must comply with federal marriage standards—standards that are out of step with the wishes of many in the United States and that are certainly out of step with the majority of Mississippians."
Both Missouri's governor and attorney general are Democrats, and they came out strongly in favor of the ruling. Missouri's constitution has banned same-sex marriage since 2004.
"The history of our country has always been one of moving toward inclusion and equality," Missouri Attorney General Chris Koster said in a statement. "I applaud the Court for their courage and strong sense of fairness. Missourians should be seen as equals under the law; regardless of their gender, race, or whom they love."
Gov. Jay Nixon concurred in a statement: "In the coming days, I will be taking all necessary and appropriate actions to ensure this decision is implemented throughout the state of Missouri."
In Nebraska—which the Associated Press said "has had one of the most restrictive same-sex union bans in the country"—Attorney General Doug Peterson criticized the Supreme Court, saying justices had crafted a "new constitutional right based upon sexual choices." But he affirmed that "[r]ecognizing the rule of law, the State of Nebraska will comply with the ruling" and state officials "will not enforce any Nebraska laws that are contrary to the United States Supreme Court's decision in Obergefell." Governor Pete Ricketts similarly said the state will "respect" the Court's ruling.
Marriages licenses already are being issued in some counties.
Republican Attorney General Wayne Stenehjem acknowledged that the Supreme Court "overrides any conflicting state, constitutional, or statutory provision," according to the Grand Forks Herald. In 2004, 73 percent of North Dakota voters approved a state constitutional amendment that banned same-sex marriage.
North Dakota Gov. Jack Dalrymple, also a Republican, issued a similar statement. "The U.S. Supreme Court has ruled that same-sex marriage is legal throughout the nation and we will abide by this federal mandate," Dalrymple said, according to the Herald.
Based on Gov. John Kasich's reaction to the Friday ruling, his administration won't try to defy the Court's decision. "I've said all along that when the Court makes a decision, we abide by the law of the land," he said. "And they made their determination and—just move on. It doesn't mean I'm not disappointed, I am, but the decision has been made."