The Obama rally drew a crowd of over 75,000 people.
Officer Thomas Brennan, who was working overtime at the rally, took a picture of the offending toilets, with the American flag still at half mast because of Police Officers Memorial Day, directly behind them. The local law enforcement memorial service had been held at the site only five days earlier.
Despite a large amount of open areas in the vicinity, the campaign staffers claimed the toilets were placed on the memorial for safety reasons to accommodate wheelchair access.
The Obama campaign has not responded to requests for an apology.
This photo by Officer Thomas Brennan shows the porta potties setup on the police memorial, with its flag still at half mast.