The two-week trial challenging the constitutionality of Pennsylvania’s voter ID law ended today. Here’s what we learned from the proceedings. Suffice to say, Pennsylvania Republicans didn’t come out looking very good. 1. A lot of voters don’t have valid voter ID. University of Washington political scientist Matt Barreto, a witness for the plaintiffs (the suit was brought by the ACLU, the Advancement Project and other voting rights groups), found more than 1 million registered voters in Pennsylvania—12.8 percent of the electorate—don’t have sufficient voter ID. Moreover,379,000 registered voters don’t have the underlying documents, such as a birth certificate, needed to obtain the right ID; 174,000 of them voted in 2008.