Is Chelsea a democrat? Has she expressed her political views? Is she a legal adult? If you answered yes to these question, then I think she is fair game.
Is Chelsea a democrat?Unknown.
Has she expressed her political views?Yes. Those that she has expressed fall into the lieberal category.
Is she a legal adultYes.
If you answered yes to these question, then I think she is fair game.2 definites, 1 unknown (well, considering the answer to the second, change that to probable). To which, I add one more overriding question; What is the basis of the attack? If it's her political views, fire at will; if it's her looks (as bad as they are and might be in any given picture), at least I think we're better than the lieberals on that score.