The poll was conducted after two mass shootings earlier in August in El Paso, Texas, and Dayton, Ohio, and a third in Gilroy, California, last month that left 36 people dead
Dmitriy Andreychenko, who was wearing body armor and fatigues, was detained by an armed off-duty firefighter who held him until police arrived, police said.
A single capital murder charge was filed on Sunday against the man accused of killing 20 people and wounding more than two dozen others at a Walmart store