Touch-screen machines . If the machine fails, there's no paper backup to audit the results. Electronic systems can also be vulnerable to tampering. Online voting . Many information technology companies are pushing the idea of e-voting, but of course it has its limits as well.
Servers can crash, and again, there's no paper backup.
Viruses could affect the accurate transmission of votes. In a recent test of e-voting, the 2000 Democratic primary in Arizona gave people the option of voting online. We'll probably never know. In future races, authentication technologies can certainly help us to verify that people are who they say they are, and that they are eligible to vote, but of course new machines can never do the job perfectly. We should make the greatest effort to ensure that we have the best technology and practices in place by Election Day, we should understand that no system is perfect and then we should hope that the candidates respect the results.