I believe it is actually more difficult than it would appear, mainly because you need to give people access to the machine to enter the candidates and when you do that, you are potentially giving them access to do other things. That said, the problem is not insurmountable. I would suggest open-sourcing the software and the hardware design. There are enough people that are interested in this problem that I expect that it would be well supported and potential security flaws found and fixed quickly. It would also greatly reduce the development costs. We would still need companies and governments to work together to build and certify the machines, but everyone could be working off a common, open blueprint.

"A commissioner for the FCC wants an investigation into whether or not phone companies broke the law by handing over their records to the NSA."

In tomorrows news, FCC commissioner resigns after phone records of calls to his mistress were leaked by the NSA.

Pope is accused of defecating in forested areas

Jackie Treehorn: Refill?
The Dude: Does the Pope shit in the woods?

The w3c also has a list of projects that use RDF. Some of them seem a bit academic, but one that looks particularly cool is eventSherpa - a semantic calendaring application that lets you publish and subscribe to RDF calendars. The FOAF project has also been gaining steam as Typepad and others join the movement.