A conservative political group asked a federal appeals court on Monday to strike down a Delaware law requiring the disclosure of donors for groups that campaign in the state, hoping it becomes the latest donor disclosure and campaign finance law to be struck down as a violation of the First Amendment.A three-judge panel on the U.S. Court of Appeals for the 3rd Circuit heard arguments in a case brought by the Americans for Prosperity Foundation against Delaware officials over a law requiring nonprofit groups that spend more than $500 in campaigning ahead of an election to disclose all donors who contributed at least $100 in the past four years. AFPF urged a federal district court to halt enforcement of the law, arguing it violates the First Amendment, but the group was denied the injunction it sought.“Two federal circuits have already noticed that the Supreme Court, in recent cases, has strengthened the First Amendment’s protections for donor privacy,” Allen Dickerson, a lawyer for AFPF, argued to the panel. “This court should join the 1st and 10th Circuits in requiring governments, when they request donor information, to show that their demand is narrowly tailored to an appropriate interest. And under that standard, Delaware has no prospect of success in this case.”