I've always admired Billy Bragg for the gusto that he set about pursuing a singing career even though he couldn't sing - not in a Tom Waitsy can't sing sort of way, but in a genuine can't sing sort of way - and because he's always been staunchly left.
This clip seems to be part of a longer sequence. Just as well he left the guitar behind, though.
1 - "Billy Bragg at Speaker's Corner," posted on You Tube by photoandpolitics, 10th of february, 2010. (http://www.youtube.com/watch?v=jMftdDvXWYk)