Love the map as a gamer, but having spent the last ten years in DC and 20 years in political advocacy, I'd suggest that the labels on the territories could use some tweaking. As the political winds shift so will these, but here's my take as of December 2008:
Liberal:
Unions
Trial Lawyers
Environmentalists
Civil Rights
GLBT
Antiwar
Feminists
Seniors
Conservative:
Big Oil
Insurance and Banking
Wall Street
Religious Right
NeoCons
NRA
Defense Industry
Big Agriculture
Print Media:
New York Times
Wall St. Journal
Washington Post
AP
Magazines
Tabloids
Electronic Media:
Blogs
YouTube
CNN
Fox
(Old) Networks
Talk Radio
Again, this is a great concept but the names of the territories could get fine-tuned a bit. And not to get too carried away with reality, but interest groups have a lot more influence over the Senate than the media does. And in my opinion, the ratio of conservative to liberal interest groups in Washington runs about 5 to 1.