Summary: Headlines for July 18, 2012; Bomber Strikes Syrian Regime in Damascus, Killing Assad's Defense Minister, Brother-in-Law; As Senate GOP Blocks DISCLOSE Act, Top Donor Sheldon Adelson Probed for Bribery and Mob Ties; Romney Dogged by Questions on Bain Tenure, Tax Returns as Obama Deems Him "Outsourcer-in-Chief"
