With Canon's Hybrid CMOS AF System and Movie Servo AF, the camera provides continuous AF for focustracking of moving subjects by helping to reduce the camera's need to "hunt", resulting in a quick and smooth continuous AF.
To help avoid overemphasis on the horse race and focus instead on what's driving the election, the tracking poll has begun to ask a series of questions on issues and events.
It has improved focustracking, so if you're autofocusing something that's moving, all of the sensors can concert with one another and track the subject better.