The state judge listening to a new round of arguments on the state’s voter identification law concluded the day-long session by directing attorneys to come prepared Thursday to argue what they think a potential injunction should look like. Commonwealth Court Judge Robert Simpson said it’s his responsibility to consider the possibility of halting the new law — which requires all voters present a photo ID card with an expiration date in order to cast a ballot — and how to tailor such an action so that it addresses why the law isn’t being properly implemented. “I think it’s possible there could be an injunction entered here,” he said. “I need some input from people who have been thinking about this longer than I have.”