federal courts which is termed “justiciability.” Flast, 392 U.S. at 95, 88 S.Ct. at 1950. Justiciability, then, seeks to ensure that federal courts address only questions presented in an adversarial context and that the judiciary will not encroach upon the powers of other branches of government. Flast, 392 U.S. at 94-95, 88 S.Ct. at 1949-50. “Thus, no justiciable controversy is presented when the parties seek adjudication of only a political question, when the parties are asking for an advisory opinion, when the question sought to be adjudicated has been mooted by subsequent developments, and when there is no standing to maintain the action.” Flast, 392 U.S. at 95, 88 S.Ct. at 1950.
A. Standing
Before a federal court may address the merits of a legal claim, the litigants must establish standing to sue. Whitmore v. Arkansas, 495 U.S. 149, 154, 110 S.Ct. 1717, 1722, 109 L.Ed.2d 135 (1990). Although the person challenging the statute does not have to await threatened injury to obtain relief, a plaintiff who challenges a statute must demonstrate “a realistic danger of sustaining direct injury as a result of the statute’s operation or enforcement.” American Civil Liberties Union v. The Florida Bar, 999 F.2d 1486, 1492, (11th Cir.1993) (quoting Babbitt v. Farm Workers, 442 U.S. 289, 298, 99 S.Ct. 2301, 2308, 60 L.Ed.2d 895 (1979)). Thus, an appropriate plaintiff is one who has “alleged an intention to engage in a course of conduct arguably affected with a constitutional interest, but proscribed by statute, and there exists a credible threat of prosecution,” not one who simply has “imaginary or speculative” fears of state prosecution. Babbitt, 442 U.S. at 298, 99 S.Ct. at 2308. With the principles of standing set forth, we now seek to determine whether the appellants had standing to challenge the statute.
At the time the appellants filed this action, Graham was a judicial candidate, a county court judge for Citrus County intending to seek reelection in 1994. During the •prior campaign in 1990, the appellants engaged in arguably protected political conduct, and the state attorney advised Graham that the statute prohibited this campaign conduct. The state. attorney declined to prosecute, however, because he believed that Graham lacked the criminal intent to violate the statute, and Graham’s opponent did not seek a grand jury investigation. Nevertheless, at the time the appellants filed this action, a credible threat of prosecution existed because they intended to engage in arguably protected conduct, which the statute seemed to proscribe. See ACLU, 999 F.2d at 1492 (stating that a plaintiff must allege that he was threatened with prosecution, prosecution is likely, or a credible threat of prosecution exists). Hence, we hold that at the time the appellants filed this action, they had standing to challenge the statute.
B. Mootness
Although the appellants had standing when they filed this lawsuit, subsequent developments have rendered this case moot. “[A] case is moot when the issues presented are no longer ‘live’ or the parties lack a legally cognizable interest in the outcome.” Powell v. McCormack, 395 U.S. 486, 496, 89 S.Ct. 1944, 1951, 23 L.Ed.2d 491 (1969).
After the appellants filed this lawsuit, the appellees withdrew their initial determination that, the appellants’ conduct violated the statute, and also informed the appellants that their intended campaign conduct would not fall within the ambit of the statute.2 Thus, the appellees cannot seek prosecution against the appellants or other judicial candidates engaging in similar campaign conduct. Clearly, then, no possibility exists that the appellees will seek to enforce the challenged statute against the appellants or other judicial candidates intending to distribute postcards or print unsolicited letters of support of the type involved in this ease in the future. See ACLU, 999 F.2d at 1494 (stating that some possibility must exist that the defen
2
Specifically, in the appellees’ Motion to Dismiss, Answer to Standard, Interrogatories, Motion for Summary Judgment, appellees briefs, and during oral argument to this court, the ap-pellees repeatedly represented that the appellants’ proposed campaign conduct does not violate the statute.