Claiming that “multiple unexplained failures” of the state’s electronic voting machines skewed the lieutenant governor’s race against Democrat Sarah Riggs Amico, a nonprofit election transparency group and a former candidate for secretary of state have sued to invalidate the election in favor of a do-over.

The suit echoes alarms raised in a separate case brought by the same group over the vulnerability of the state’s aging electronic voting system to hackers, viruses and other malfunctions and its lack of any paper audit trail.