Trademark question of the day, Hamilton edition

Yes, this is a Hamilton blog for the foreseeable future.  As they say, sorry not sorry.  Last night, Bernie Sanders sent me this email:

Fellow Hamiltunes fans (many of whom are almost certainly in Sanders' target demographic, like me) will recognize the subject line.  Does the First Amendment protect Sanders' use?  I'll tell you this: he earned a bunch of goodwill with me!