Where They Stand is a Nightly News series that takes an in-depth look at the presidential candidates and the issues they're debating, including education, health care and immigration.

Week I: China
Week II: Iran
Week III: Same-sex marriage
Week IV: Energy
Week V: Immigration
Week VI: Taxes
Week VII: Globalization
Week VIII: Medicare and Social Security
Week IX: Pakistan
Week X: Iraq
Week XI: Guns
Week XII: Abortion
Week XIII: Science
Week XIV: Consumer issues
Week XV: Education