ARS Technica has an article about electronic voting:
What if I told you that it would take only one person—one highly motivated, but only moderately skilled bad apple, with either authorized or unauthorized access to the right company's internal computer network—to steal a statewide election? You might think I was crazy, or alarmist, or just talking about something that's only a remote, highly theoretical possibility. You also probably would think I was being really over-the-top if I told you that, without sweeping and very costly changes to the American electoral process, this scenario is almost certain to play out at some point in the future in some county or state in America, and that after it happens not only will we not have a clue as to what has taken place, but if we do get suspicious there will be no way to prove anything. You certainly wouldn't want to believe me, and I don't blame you..