Responders were able to put their X on a piece of paper plonked in front of them; they may not do quite as well if they have to find a polling place, select the correct day, uncap the pen, work out which way up the form has to be and pick the box to mark when the pollster hasn't got his finger pointing out where to make the mark, all without any chance of getting paid for her/his hard work. Of course, you could up the odds by pointing out they can slip the pen in their pocket after making the sign of approval and thereby make a small but measurable untaxed profit.
Entropy is not what
it used to be.