More Voting Machine Problems

[Cheryl Nelson]

http://www.rgj.com/article/20121101/NEWS19/121101029/Republican-National-Committee-alleges-voting-machine-troubles-Nevada-other-swing-states?gcheck=1&nclick_check=1

This statement is troubling:

"While it is possible for a voter to inadvertently select a candidate, it is not possible for the machine to automatically select a candidate,” Miller said in his statement."  Meaning?

"Calibration" is also troubling.  Aren't these machines electronic?  What exactly needs calibrating?  Anyone know?