An empty Clinton-ish gesture. If he or his wife know that they don't have HIV, what is the signal? To not be worried if you don't have HIV? Well, if you think you might have it, then you might not want to be revealed (in that culture).
What an oink.
I think the point [without reading the article] is that AIDS tests are safe and a good thing to do. He's leading by example. [Every once in a while, a member of the Democrat Party does something good--even if only by accident.]
I hope he asks Bill and Hillary to take one as well, before Obama and Hilklary start posing together on stages as running mate for thew 2008 campaign.