The Freakonomics guys said at one time that we need to be clear about
the natural errors within any system, and when the vote is closer
than that error value, decide on what to do about a "tie" rather than
fretting about chads, hackers, broken machines and so on.
Basically voting like any other process is imperfect and trying to
make it more accurate will never chase all the error out.
That said, statistically interesting systematic errors should be
revealing, I think.
-- Owen
Owen Densmore http://backspaces.net
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