I'm glad to see a few congressman with sensible feelings on this issue. The demographic for Sesame Street, at least in the US, is way too young to need to hear about AIDS. If US Sesame Street gets an HIV positive puppet, I'll be using some other form of visual stimulation for my children, without the help of Bert or Kermit.
The letter sent to PBS includes the following, which I do feel is appropriate and should be considered heavily by the broadcasting company.
"We would like to inquire as to whether there is other PBS programming, aimed at an older age group, which may be more suitable for such sensitive messages."