Electronic voting, in addition to security concerns, isn't even a user experience improvement.
I remember working at a polling station as a teenager during the 2004 election. One elderly lady needed help understanding how the machines worked, so I showed her how you tapped the buttons on the screen.
Well, this woman had lost a lot of fine motor control. After selecting her choice for president, she went to hit the Next button. Her hand shook so badly that she skipped about five screens worth of races.
I asked her if she's like my help going back to choose candidates for all of the races she accidentally skipped. "No," she replied, "I got the important one."
I'm thankful that this experience, and many others from working the polls, eroded my faith in the system early on in life.