Long-time SC regulars may recall that rdf posted here for a while. Apparently he has passed away . SC certainly wasn't his primary online home, but he provoked some good discussions here and participated in the community, so I thought I'd put up a note.
My impression was that rdf appreciated the contrast between "blue" and "red" in terms of political debate, so this picture of his seems as good a marker to put here as any. RIP.