One thing I need to point out:
The electronic machines to which I'm referring are not the touch screen ones you've been mentioning.
The machines tried out in Harris County for the first time anywhere (as far as I know) are manipulated by a wheel set in a keyboard apparatus.
The wheel is similiar to a mouse in that as you turn the wheel different parts of the screen light up, and when the part of the screen you want is lit, you press the "enter" button to record your preference.
If you're familiar with manipulating a mouse, this is a snap, but in lower and lower-middle working class neighborhoods, computers are not common.