Like a lot of things in politics, it is a question of enthusiasm and motivation. There might not be a single individual person in this country in which reducing copyright protection is their most important issue (and if there is, I think that person has crazy priorities), but strengthening copyright is probably the single most important issue for Disney and other long-established media companies. Having a large group of people who are mildly in favor of something is much less likely to yield political change compared to a small group of people who feel incredibly strongly about that issue. This is the whole reason behind niche lobbying groups ranging from the NRA to the EFF and why those groups are able to have such a large impact on politics relative to their size.