A Question About a Letter

So, there's this thing, "Restating the Obvious: An Open Letter from the Libertarian Movement."

I don't remember how it came to my attention, nor do I recall anyone asking me to sign it, let alone demanding that I do so. When I found out about it, I read it, I agreed with it, I decided I wanted to add my voice to it, and I used the contact form at that site to do so.

Now I hear that it's a "loyalty oath" of some kind, so I have to ask:

Is there anyone out there who has been, in any way, shape, manner or form, pressured or bullied to sign it?