“. And it especially cannot endure when powerful groups in that society seek at every turn to undermine and destroy its very being. The threats to democracy are not always from enemies abroad. They can come from those within who espouse the language of democracy and use the liberties afforded them by democratic institutions to undermine the substance of democracy. Weimar cautions us to be wary of those people as well. What comes next can be very bad, even worse than imaginable.”