"This clause permanently disenfranchised everyone qualified to vote who had not registered to vote in a twelve-day window between April 30 and May 11, 1916, except for those who had voted in 1914.While designed to be more resistant to challenges based on discrimination, as the law did not specifically mention race, the Court struck it down partially because it relied on the 1914 election, when voters had been discriminated against under the rule invalidated in "Guinn."