“Anyone who has struggled with an interactive display in a museum knows how dodgy touchscreens can be. If they don’t freeze, they easily become misaligned, which means they can record the wrong data. In Dallas, during early voting before last November’s election, people found that no matter how often they tried to press a Democrat button, the Republican candidate’s name would light up. After a court hearing, Diebold agreed to take down 18 machines with apparent misalignment problems. “And those were the ones where you could visually spot a problem,” Dr Mercuri says. “What about what you don’t see? Just because your vote shows up on the screen for the Democrats, how do you know it is registering inside the machine for the Democrats?” (From here)