Obviously, the list of 12 Ways You Can Tell If Your Representative is a Space Alien were inadequate or you would have scanned them in too. In the face of such a pressing crisis, I think it's incumbent on us to generate our own list.
I nominate:
1. If your Representative is bald and bug-eyed, do they seem completely unself-conscious about the fact, or do they have a pathetic comb-over and wide-rim glasses like a normal human being?
2. Is your Representative somewhat too excited about discussions of a possible "Mars Probe".
3. Would you really be all that surprised if you learned that your Reprensative abused themselves while gazing at a picture of Nancy Reagan while chanting- "Oh, yes, spank me my Queen" ?