Pictures from the confrontation are here.
Adam Kokesh is certainly not a household name, but he is trying to become one.
Here is a little video as a means of an introduction:
From the Wikipedia page on Adam Kokesh:
On May 18, 2013, Kokesh was arrested in Philadelphia by Federal Park Rangers together with other protesters at the 5th iteration of a marijuana legalization rally known as Smoke Down Prohibition. The Smoke Down event has occurred at Independence National Historical Park in downtown Philadelphia once every month since January 2013 with no prior arrests or police intervention. Don Dezarn was widely criticized by online commentators for possibly planting something on Kokesh, but he has been publicly defended by Kokesh’s own producers and others who were at the rally. Adam Kokesh and N.A. Poe appeared before a judge on Monday May 20th and were charged with assaulting a federal officer and resisting arrest. Wide speculation on the internet claims that the Federal government seeks to harass and intimidate activists with the arrest of Kokesh who has called for an armed march on Washington D.C. on Independence Day July 4, 2013. Kokesh’s federal charges were reduced to violations on May 24th and he was released. 
Along with his release on May 24, 2013, Kokesh called for a “Final American Revolution” to take place on July 4th, 2013 in place of the previously planned armed march on Washington D.C.. This is planned to take place in all 50 state capitols with protests to be only absolved by each governors agreement to initiate an orderly dissolution of the federal government through secession.‘
This little ‘l’ libertarian is a strong supporter of Ron Paul, a veteran of Iraq who organized anti-Iraq-war protests (for which activity he just might have been singled out for ‘extra attention’ by The State) and an anti-prohibitionist. And, he is doing his best to gain notoriety in order to affect politics and preserve civil liberties.
Adam Kokesh is as cute as a little puppy – who just might grow up into a big dog!
So, like him or hate him, you might just hear more from and about him…