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grandfather clause
Part of the system of Jim Crow in southern states used to enforce segregation in primary elections. In its typical usage, a voter could vote in Democratic primary elections if his grandfather had been able to vote in Democratic primaries. Blacks whose ancestors had been slaves were thereby excluded but whites were made eligible, even poor whites who might otherwise be disenfranchised by the burden of a poll tax or by literacy requirements.
Where found in Texas Politics
  vce, section 5.3