 People voting by mail would have to use an identifiable number, such as part of a driver's license or social security number, along with their signature. The initiative is backed by a political action committee known as Repair the Vote. Republican Governor Joe Lombardo also supports the effort. Opponents of the measure have long argued that voter ID requirements are an unnecessary barrier to voting. Nevada doesn't require voters provide any type of identification before voting. However, they are required to give a signature that matches one in state records.