What are some cases where a state or federal court has found unconstitutional voter qualification examinations that exclude non-military personnel from voting in elections?

20 Carrington v. Rash (1965) 380 U.S. 89, 85 S.Ct. 775, 13 L.Ed.2d 675, held unconstitutional a Texas law which barred all servicemen who had moved to Texas during their military service from voting in any state election.

21 Louisiana v. United States (1965) 380 U.S. 145, 85 S.Ct. 817, 13 L.Ed.2d 709, banned the employment of voter qualification examinations with such discretionary standards as to permit their use as deliberate devices for racially motivated exclusions.

22 Harper v. Virginia State Bd. of Elections, Supra, 383 U.S. 663, 86 S.Ct. 1079, invalidated state laws requiring the payment of poll taxes as a condition to voting in state elections.