I stumbled across one of the rallies (the one on Millenium Bridge) and i'm a massive fan of Obama so I took a bunch of photos. Then I heard about your last rally in Parliament Square through some friends, so I went along to take some more pictures and I never thought much more about it.
Well anyway I recently put together a slideshow of the pictures to show to a few friends and when I came across your blog I thought you might be interested in seeing it as well. It's available here.
Thanks Simon - lovely pics.