Ask and you shall receive. Wheaton College has posted all of the audio and video from their 2013 Theology Conference, "Christian Political Witness." You can check out all of the audio and video from that conference here.
The audio from Peter Leithart's lecture on "Violence" can be found here.
The video recording of that same lecture can be found here.
A link to the audio and video of a separate panel discussion with Peter Leithart, George Kalantzis, Mark Noll, David Gushee, and Jana Bennett can be found here and here.