In the second day of testimony on whether the state’s tough new voter-identification law should stand, it was all about the numbers. Specifically: how many Pennsylvania voters do not have acceptable forms of photo ID to vote under the new law – and why estimates of that number have varied so widely since the law was moving through the legislature in March. In court Thursday, a University of Washington political scientist with extensive background in polling testified that his survey found that more than one million registered voters, or 12.7 percent, lacked valid identification to vote.