I read about this the other day. According to the article, It's Obama who went out and bought the equipment and started brewing. (maybe subsequent batches are being made by the cook?) Also according to the article, he is the first presidential homebrewer.
I'd like to see that article if you can find it. It certainly contradicts what I've heard. This article http://obamafoodorama.blogspot.com/2011/03/obamas-make-history-with-homebrewed.html makes it sound like it's the chefs who are brewing. And I certainly hope he has more important things to do than buying equipment and brewing beer.
And what could possibly be more important than a new boilermaker pot, and spending an afternoon playing with it?