FYI - "Concerned Women of America" is hardly a "women's group" in that even though its members are of the female gender, their whole raison d'etre is to try to show that not all women support the idea of feminism/equal rights. Like most "morality groups" (ie "Focus on The Family", "Family Research Council" or "Parents Resource Center"), their name was chosen to make them seem like something they're not, hiding their ultimate agenda.
Obviously i don't think much of the cartoon itself but in its context - a politcal cartoon on a political site used to illustrate the organization's position - i don't believe it should be censored. (I also don't believe that being a political cartoon that it would fall into the category of "copyright infringement" for reasons already well stated by others. However, a case could better be made for slander or libel.)
I know it's very easy to get mad at the cartoonist. But in all honesty, the illustrator is really just a puppet (no pun intended) to the board of the organization as the views it's chosen to espouse. If you want to get angry at anyone, get angry at those who want to distort the basic facts of "South African Sesame Street introducing an HIV+ character to teach about how it's okay and safe to be friends with an HIV positive person" and deliberately twisting the facts to scare the general public into supporting one of its longtime goals: the dismantling of public television. What's really sad is (at best) the heads of these organizations who raise the fuss read the original sources and rereport the news to its followers stating the opposite. I realize that i'm giving them the benefit of the doubt of being able to read the original facts and later distorting them to serve their cause as opposed to not even being able to comprehend what was pretty clearly stated to begin with themselves - but if that worst-case scenario is indeed the case, it speaks volumes that Sesame Street would be on their hitlist - something that teaches children to read better than they themselves are able to.
CWA and like groups have chosen the South African character as a scapegoat to denounce matters of no direct relevance here in the States to further their goals. Unable to gain support with logical facts, they prey on people's fears relying on situations like this to get people up in arms by trying to shout their lies louder than the facts so what begins as a statement by Sesame that "there are no plans to bring the character to USA Sesame and even in South Africa Sesame, it will be done age-appropriately and not talk about sex" becomes "ATTENTION AMERICAN PARENTS - WE'VE WARNED THIS WOULD HAPPEN AND NOW IT IS - SESAME STREET HAS BEEN HIJACKED BY SEXUAL PERVERTS AND IS GETTING A MUPPET WITH AIDS WHO WILL BE TRYING TO TEACH YOUR YOUNG CHILDREN SEX EDUCATION!" The cartoon itself is merely an accessory to the overall mission. As purely a propaganda tool, it's quite well done because in addition to getting people upset as Sesame Street, it also tries to get the viewer to believe/accept CWA's views that an HIV positive person - even a child that was born with it - equals overall sexual deviancy. The cartoon does just what it's supposed to do. Therefore, rather than shoot the messenger, if you're angry with the cartoon, you should be upset with the atmosphere from and the goals of those who are trying to turn a responsible overdue attempt to tackle a severe problem in South Africa into fundraising fodder for their own local political agenda.