The thirteenth edition continues to provide a comprehensive overview of constitutional law, focusing closely on Supreme Court decisions. Key new principal cases or case summaries -- running the gamut from separation of powers and due process issues generated by the War on Terror, to questions of special standing of states to sue on behalf of their citizens in the fight against global warming, to abortion rights, school integration, voter registration, limits on punitive damages, eminent domain powers, speech in schools, campaign finance regulation, the role of religion in public life, and the entirely new doctrine of individual gun ownership rights outside of militia service -- include: Massachusetts v Environmental Protection AgencyGonzales v. RaichHamdan v. RumsfeldMedellin v. TexasBoumediene v. BushPhilip Morris USA v. WilliamsKelo v. New LondonGonzales v. CarhartDistrict of Columbia v. HellerParents Involved in Community Schools v. Seattle School Dist. No. 1Crawford v. Marion County Election BoardMorse v. FrederickFederal Election Commission v. Wisconsin Right to LifeDavis v. Federal Election CommissionMcCreary County, Kentucky v. American Civil Liberties Union of KentuckyVan Orden v. Perry Cutter v. Wilkinson These and other cases, along with enhanced discussion materials cutting across constitutional doctrines, give maximum flexibility to instructors to tailor their courses as they see fit, while providing students with a breadth and depth of raw materials from which they can learn to synthesize and analyze, both in the classroom and on their own.