People who identify as pro-choice are really motivated. But generally speaking, it's hard to get people to get active. People's lives are busy and hectic. People just like to talk about it. I try to go into a community and let them know there are other people who have those same ideas.
Regular people can make a difference.
Getting letters or faxes from constituents makes politicians pay attention. Public officials among other things want to get reelected. The belief in the cause. Your beliefs about what you're doing every day is such a motivator to do good work. Funding for international family planning is something that comes up every year.