Health care reform and criticism of weapons

I spoke last weekend at a public library in Blue Hill, a small coastal town in Maine. Most in the audience worked and voted for President Obama, but in the course of what was a very interesting conversation, it became clear that most of them haven't done much since then. How to explain this? Probably they thought that they had done their part in electing a new president and that the country would move in a progressive direction on the strength and momentum of that victory. Obviously, this hasn't happened.