I have to admit I hadn't heard of Tom Rush before seeing a copy of a concert CD/DVD, Celebrating 50 Years of Music, on my amazon page, so I had a listen on Grooveshark and very much liked what I heard. Here's The Circle Game. He is one of those figures I should have known about given his influence, but it seems he has kept a relatively low profile over the years, playing with various groups, who support him in this concert.
Last year, also saw a documentary on him that premiered at the New Hampshire film festival, with Rush on hand to play a few songs after the screening. You can find clips of the documentary and festival appearance on Youtube.
It really is amazing the urban folk music legacy we have in America, and that so many young persons are tying into it again. Rush was one of the key figures of the 60s. His 1968 No Regrets is one of the standards of the era and has been covered several times, including by Emmylou Harris on her album Bluebird, which is where I first heard the song.