Restrictive voting laws in states across the country could affect up to five million voters from traditionally Democratic demographics in 2012, according to a new report by the Brennan Center. That’s a number larger than the margin of victory in two of the last three presidential elections. The new restrictions, the study found, “fall most heavily on young, minority, and low-income voters, as well as on voters with disabilities. This wave of changes may sharply tilt the political terrain for the 2012 election