This comment in a CT thread, with its reference to Pete Seeger, reminded me that he had sung "This Land is Your Land" (along with his grandson and Bruce Springsteen) at the Obama inaugural concert in Jan. '09 and had included a verse with a political edge that is sometimes omitted -- but I couldn't quite remember the verse.
There was a big high wall there that tried to stop me;
Sign was painted, it said private property;
But on the back side it didn't say nothing;
This land was made for you and me.
I recall that the historian Michael Kazin, in a Wash. Post piece not too long after the inaugural concert, noted approvingly the inclusion of this verse. Some of those now in the 'occupy Wall Street' protests might wish that the verse's general spirit had exercised more of an influence on certain administration policies, though I understand their main complaints are directed elsewhere (properly, in my view).