I'm sure you already see that there would be a great many people that wouldn't have, or whose signatures could be so shakey that you could not be sure. Easier to fake if those were older people that have a known predisposition to lose motor skills due to geriatric diseases.

This security hole just writes itself. It's not hard. I've been complaining about these security issues for a long time, way before this election, and way before Bush's hanging-chads