Whether Gilbert's differing restrictions on ideological, political, and temporary directional signs were content-based regulations of speech.
Holding
Yes. The sign code was facially content based because the applicable restrictions depended on the message a sign conveyed.
Reasoning
A speech regulation is content based when it applies to speech because of the topic discussed or the idea or message expressed. Courts must first examine the law's text: a facial distinction based on a message triggers strict scrutiny, whether the distinction is obvious, such as a subject-matter line, or more subtle, such as a line based on a message's purpose or function.
Gilbert's categories required officials to read a sign and determine what it communicated. A sign directing people to a qualifying nonprofit event was a temporary directional sign; a sign intended to influence an election was political; and a noncommercial sign conveying ideas outside the listed categories was ideological. The code then assigned each message category different limits on size, number, location, and duration.
The Ninth Circuit incorrectly focused on Gilbert's assertedly benign motives and content-neutral interests in traffic safety and aesthetics. A law that is content based on its face remains subject to strict scrutiny even if the government did not act from hostility to a message and can articulate a content-neutral purpose. Improper censorial intent may establish content discrimination, but it is not necessary to establish it.
The Court also rejected the Town's argument that viewpoint neutrality made the code content neutral. Viewpoint discrimination is an especially egregious form of content discrimination, but the First Amendment also forbids differential treatment based on subject matter. Favoring ideological messages over political messages, and political messages over event-direction messages, is content discrimination even though the code treated all viewpoints within each category alike.
Nor could the Town characterize the distinctions as speaker based or event based. The same restrictions applied regardless of who posted a sign, and in any event a speaker-based classification does not automatically become content neutral. Likewise, the presence of an event such as an election does not erase the content inquiry required to decide whether a sign concerns that event.