I've read about that before :) , there was also a short story by Asimov in which the Voter was chosen at random.

For example, here's a paper from Yale:

http://digitalcommons.law.yale.edu/cgi/viewcontent.cgi?artic...

some random blogs:

http://equalitybylot.wordpress.com/2011/01/14/ben-saunders-c...