winston-salem n.c. minority voters north carolina hard time cast ballot presidential election year judge allow law require photo identification poll take effect challengers law say federal court monday lawyer represent state say small number people may necessary form identification exceptions allow amend version measure policy question lawyer thomas farr say evidence rise anywhere close show discriminatory intent trial winston-salem one several closely watch vote right battle play across country democrats republicans fight white house november democrats argue voter id laws pass republican-led state legislatures target voters typically support democratic party proponents measure say intend prevent voter fraud case north carolina test key piece broad vote restrictions pass soon u.s. supreme court rule 2013 state history discrimination long need federal approval vote law change affect minorities u.s. justice department national association advancement color people argue north carolina revise vote protocol disproportionately burden african-americans hispanics likely white lack acceptable form identification law threaten deter confuse disenfranchise voters say michael glick lawyer represent naacp set solve problem never exist last summer u.s. district judge thomas schroeder hear arguments state decision shorten early vote period end same-day registration eliminate pre-registration 16- 17-year-olds stop provisional ballot cast outside correct precinct count issue decision voter id requirement get separate vet lawmakers amend 2015 ahead initial trial voters cite reasonable impediment able obtain acceptable identification allow cast provisional ballot south carolina state reasonable impediment provision farr say challengers say law remain discriminatory could give election workers much discretion unknown schroeder rule state presidential primaries march north carolina 's voter id law go trial