""Which of the following possible plaintiffs other than Doe would be most likely to obtain an adjudication in a federal court on the validity of the "Capitol steps" statute?
A politician intending to make a campaign speech on the Capitol steps during a prohibited time.
A legislator who voted against the statute because he thought it unconstitutional.
An organization whose purpose was "to seek judicial invalidation of unconstitutional laws."
A state taxpayer in the highest tax bracket.