I give you the speaker of 2006, Senator Barack Obama
I highly recommend you fast forward to 19:08 to hear the bit he says about Wall Street and War almost two years ago. It's remarkably poignant and could be a campaign speech but it's not.
Also, the commencement speaker of 2005, Senator John McCain
If anyone is interested, the commencement speaker the year I graduated was Supreme Court Justice Ruth Bader Ginsburg and she was BORING.