[Mr Radical]

If you follow the vid on Liveleak frame-by-frame, there is no doubt who was responsible - the female in the blue and white hat. Her sleeve cuffs match those with the lighter, and no one else was wearing anything similar. I would say that video alone is enough evidence for a court of law. It is possible she borrowed the lighter from the bag of the woman in yellow.

[Ouchthatonehurt]

Daily Caller is on this. Good frontal pic of perp...
http://dailycaller.com/2017/01/22/can-you-identify-this-woman-who-set-a-trump-supporters-hair-on-fire-in-dc-on-inauguration-day/