Mystery Bird

Yesterday, Mom and I were birding at Poinsett State Park. A couple friendly birders from Oregon told us about a bird they had seen hopping around in front of their car. They thought the bird might be injured. I went over to take a look and was surprised to find this small bird. It was hopping on the ground, eating insects along the way. It allowed me to approach it pretty closely, and presumably was unable to fly. I would like opinions on the species of this bird. I have my own idea, but I'd like to see what others say!