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Residents of a city complained that bright signs distracted drivers on the narrow streets of Heritage Row and clashed with the district's historic storefronts. In response, the city council enacted an ordinance requiring any sign or visual display visible from the district's public streets to be black and white and no more than four feet long or wide. A political party wants to hang a six-foot red, white, and blue campaign banner in front of its rented office in Heritage Row. The party files suit challenging the ordinance as applied to the banner. Which argument is most useful for the political party?