A few years ago, we hosted a conference at GMU to honor Professor Buchanan that featured Henry Manne, Amartya Sen, and Elinor Ostrom. This was followed up over the next few days with a conference with papers by leading political economists such as Tim Besley and Mike Munger. The papers from the conference were published in the Journal of Economic Behavior & Organization, 80 (2) 2011.
Below is the video of the conference panel with Manne, Osrom and Sen, and of course Professor Buchanan himself. The video recording does not start off great, but a few minutes in, it is working just fine, and a highlight is Lin Ostrom's presentation.