Chief Justice Roberts wrote the majority opinion in which five other justices joined and in which two other justices concurred. Justice Thomas dissented. 

Roberts pointed out that “the PRA is not a prohibition on speech, but instead a disclosure requirement. ‘[D]isclosure requirements may burden the ability to speak, but they . . . do not prevent anyone from speaking.’” Doe v. Reed Slip opinion at 7. But Roberts also pointed out that the Court’s decision dealt only with the facial challenge to the release, not with an “as applied” standard related to this particular petition, which could still be asserted by the plaintiffs in the District Court.

Justice Scalia, with his characteristic reference to history, concurred with the judgment and wrote to point out that the signers of the petition were engaging in a legislative act and that legislative actions in the United States were consistently considered to be actions taken in public. Even voting by the public was traditionally a public act, and secret ballot voting had only come to be generally accepted in the United States in the 1890s when most states adopted the Australian model of voting by secret ballot. Scalia noted that there was no constitutional basis for saying that a state could not decide to keep the identity of petition signers secret, but “It may be a bad idea to keep petition signatures secret. . . . Requiring people to stand up in public for their political acts fosters civic courage, without which democracy is doomed.” Scalia, concurrence at 10.