Here is the feed from Flickr From the Obama Campaign...

http://api.flickr.com/services/feeds/photos_public.gne?id=94975828@N00&format=rss_200

And here is the Obama official Flickr ID:
94975828@N00This can allow you to create interesting 3rd Party Widgets and services like these below:

SplashR version of the Barack Images
http://splashr.com/show/black/94975828@N00/25