NEW : Holder says ruling is `` a major step backward '' Supreme Court decision clears the way for enforcement of voter ID law in November election . `` The greatest threat to public confidence in elections in this case is the prospect of enforcing a purposefully discriminatory law , one that likely imposes an unconstitutional poll tax and risks denying the right to vote to hundreds of thousands of eligible voters , '' Ginsburg wrote . Comment: Decision is an `` affront to our democracy , '' NAACP leader says .
NEW : Holder says ruling is `` a major step backward '' Supreme Court decision clears the way for enforcement of voter ID law in November election . Comment: Decision is an `` affront to our democracy , '' NAACP leader says .