a similar site could be spun w/ the opencalais api from reuters, although i've noticed it attribute quotes to the subject rather than the speaker when context gets vague. afaik, quotations are also only available in the rdf-formatted feed.
my new "how far can i get on this today" project: a (visual) way to connect quotes that contradict both the speaker and within party lines.
That way you'd see more Obama says, McCain says on specific events or aspects of the topics.