Norris

 was a President of the United States. According to the Eighth Doctor, he immediately succeeded Bruce Springsteen. (EDA: Interference - Book One) Norris was a Republican who had initiated an economic opportunity initiative that stressed local development. His administration had promised that if a citizen were out of work, the government would find a job for the unemployed locally. This was a popular notion, because it meant that the unemployed didn't have to travel around the United States looking for work. Indeed, Californian cleaner Maria Chavez, at least, looked back on the Norris Administration as "the good years". (NA: Cat's Cradle: Warhead)
 * Norris' first name wasn't given in either of the stories in which he was mentioned. The implication of him being tagged as a Republican is that he was meant to be Chuck Norris, though this is never made explicit.