There are several bills in Congress directing the TSP board to investigate the implementation of "socially responsible" funds. One is aimed at Sudan. The other aimed at Iran. Personally, I think this is a terrible idea. TSP's goal is to help provide a secure retirement for federal employees. These bills would initiate a process of politicizing TSP. 
http://www.washingtonpost.com/wp-dyn/content/article/2007/06/03/AR2007060300872.html
http://www.washingtonpost.com/wp-dyn/content/article/2007/06/03/AR2007060300872.html
