They'll need gas masks and ear plugs for sure, but they'll also need to dress in layers and wear waterproof clothes.  It's sub zero and the police are using water cannons and mixing in pepper spray to the water.  Frostbite, hypothermia, and skin irritation are problems there.

 Tulsi not only stands up for what is right, she shows up for doing what is right - whether it is popular or not.  That shows political courage and personal integrity.