[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/09/11/art.forum.9.11.cnn.jpg caption="Weigh in with CNN's analysts and contributors."](CNN) –On the anniversary of the September 11 attacks, presidential candidates John McCain and Barack Obama each take the stage to discuss service and civic engagement in a forum at Columbia University.
What do you think of their ideas? How does the role of service determine what kind of nation we live in? What does national service mean to you?
Along with CNN Senior Political Correspondent Candy Crowley, CNN Senior Political Analyst Bill Schneider, CNN Political Analyst Roland Martin, and Republican strategist Bay Buchanan, thousands of you weighed in.
Click "comments" below for a look at the entire conversation.