Lawrence Lessig's Keynote at the Rootstrikers.org conference in SF on Saturday. Rootstrikers is a movement with the singular goal of rooting out corruption and money from politics in the US. I was fortunate to be able to attend in person - Inspirational. Definitely check out the numerous talks.
TIP: Jump to 2:13 to hear Lessig’s keynote.
And if you missed his outstanding Ted Talk - watch it online!