Just to be clear, this isn't an App Store app, but a web app. And it wasn't created by Obama's team, but by Cerado, using their Ventana service. And in all honesty, they also have a web app for other mobile devices, as well as a widget you can post on your site.
You can find all of them here.
Here's what Christopher Carfi, co-founder of Cerado, had to say on his site, about Creative Commons on Change.gov and the creation of these apps and widgets:
This opening up of the content on Change.gov has the stated intent that "anyone can take the policy points and discussions from the site and create their own remix or branch of it."
Thanks to this important step by the administration, we were able to create both mobile and widget versions of the site using Cerado Ventana.