Knight Pulse: Can online comments encourage reader action and support?

From the Knight Foundation community site Knight Pulse:

At last week’s DrupalCon in Washington, D.C., Pulse talked with Nick Aster about how the new Mother Jones site encourages reader action and support.

Find out what “reader-supported journalism” means to Mother Jones, and what they hope to do in future iterations of the site.

How do you think a journalism site can best encourage reader actions?