2010/08/04 Headlines: BP Claims Progress in Sealing Well; Worker Kills 8, Self at Conn. Warehouse; Senate Opens Debate on Kagan Nomination; Groups File Suit over Assassinations List; Toll from Pakistan Flooding Tops 1,500; 17 Killed in Iraq Attacks; New York Clears Ground Zero Mosque Plan; US Envoy to Attend Hiroshima Memorial for 1st Time; Senate Delays Vote on Ratifying Russia Nuke Treaty; Pentagon Denies Embed Request to Reporter Behind McChrystal Story; Judge to Rule on California Gay Marriage Ban; Activist Marilyn Buck Dies at 62