The Security Mentor

Computer Science professor Avi Rubin worked as an election judge in the Maryland primary.

If you're in too much of a hurry to read his whole post, here are some high points:

Throughout the early part of the day, there was a Diebold representative at our precinct. When I was setting up the poll books, he came over to "help", and I ended up explaining to him why I had to hook the ethernet cables into a hub instead of directly into all the machines...After a while, I asked him how long he had been working for Diebold because he didn't seem to know anything about the equipment, and he said, "one day."

and

...if the tamper tape had been peeled off and put back on, nobody except a very well trained professional would notice it.

and

I believe that fully electronic systems, such as the precinct we had today, are too fragile. The smallest thing can lead to a disaster.

to the extent that he

worried that the election process would completely fail.

Imagine a corrupt election official looking at a fragile systme like this and realizing that he could sabotage the opposition's strongest precincts and make it look like an accident.