The Woodstock version was sung by Joan Baez and Geoffrey (spelling?) Shurtleff. Shurtleff introduced the tune by dedicating it "to Ronald Ray-gun - Zzzzzzzzzzzzzzzzap!"

Thanks for the info about it's having been written with Ralph Emery in mind; ever since first hearing it in conjunction with Woodstock, I've never been able to hear or play it without associating with RR, the Great (sic) Communicator (sic).

And on the head of McGuinn returning to his folk roots, if you haven't yet heard his multi-artist collaboration "Songs from the Folk Den", (featuring Jean Ritchie, Pete Seeger, and Joan Baez among many others) you're missing some wonderful music. (Personal thanks to Mudcatter Dharmabum for having turned me on to that particular gem!)