I am surprised advocates of free speech rights like FIRE do not acknowledge in their amicus briefs that TM registrations for political speech can be invoked to chill the speech of others who want to use the mark in the same way. I argued this back in 2022: https://blog.ericgoldman.org/archives/2022/03/trademark-registration-of-political-messages-for-expressive-merchandise-in-re-elster-guest-blog-post.htm