Moment after nail-biting moment, the events shoved us through a week that felt like an unremitting series of tragedies: Deadly bombs. Poison letters. A a colossal explosion. A violent manhunt.
Braced for a fight, President Barack Obama unveiled the most sweeping proposals for curbing gun violence in two decades, pressing a reluctant Congress to pass universal background checks and bans on military-style assault weapons and high-capacity ammunition magazines.