We accept that governments can compel companies to be honest in their advertisements, and to include safety warnings and ingredients lists, in order that consum

We accept that governments can compel companies to be honest in their advertisements, and to include safety warnings and ingredients lists, in order that consumers in the marketplace can make informed decisions. For democracy to function, we need political messages to compete in the marketplace of ideas, so it doesn't seem like completely uncharted territory for legislation to say that companies are merely forbidden to delete purely political comments for purely partisan reasons. That actually seems like a much more modest interference with corporate speech than requiring companies to actively add text to their ads and packaging.