David Wright is a protestor against Roy Le Grange.
The first time we see him talking to a sheriff telling him that he has the right to protest here, the sheriff led him away. But David returned and started handing out the leaflet, and gave one to Dean, Dean took it, and Sam told David that he's doing a good job.
Later he is attacked by a Reaper, Sam hears him cry out and tries to get him away from the Reaper, finally the Reaper reaches him and David collapses. Sam is puzzled, but Dean sees Sue Ann using a Coptic cross and interrupts her. The Reaper withdraws and David survived.