What's tough? Running. We're not big runners in Dallas. What's tougher than running? More running, but this time in mud. Tough Mudder has the official seal of "Difficult to Accomplish" from us at the Observer. Photographer Zara Walsh was on hand to get shots of these brave fools.
Marchers gathered at Belo Garden Park and peacefully made their way throughout downtown Dallas for the ninth consecutive day. Protesters are demanding…