When state Rep. Tony Exum campaigns door-to-door, he carries a receipt for a poll tax. It's dated Feb.24, 1964, and was given to him by a constituent. Poll taxes, a charge that had to paid to register to vote, along with other methods of preventing blacks from voting in the Jim Crow South such as literacy tests - are a reminder of the importance of observing Juneteenth, Exum says. "I carry (the poll tax receipt) around with me and when I come upon people that say their vote doesn't count or 'I'm not registered,' then I challenge them," Exum said.