Obama seems to have a Flickr account, and it looks pretty genuine. Of course, I immediately made Barack Obama one of my contacts :-)

I searched to see if Hillary Clinton had an account, and the only two results were not valid. Searching for John McCain yielded absolutely nothing. Not surprisingly, under-under-underdog candidate Ron Paul does have a Flickr account, though his photos are far less polished than Obama's. Interestingly, Obama's photos are released under a Creative Commons license, while Paul's are copyrighted.