Overview: Tonight, presidential candidate and author of Promises to Keep: On Life and Politics, Senator Joe Biden. Jon begins tonight reporting on Barry Bonds hitting 756 homeruns, breaking Hank Aaron's record. Senior Correspondent Rob Riggle talks to Jon about where he was during this historic event. Jon then reports on the missing 200,000 weapons given to Iraqi security forces in a segment called "Going, Going, Gun". General Petraeus explains this mishap by saying it was a clerical error. As Jon notes, this isn't the first time something has gone missing in Iraq. The list includes such things as 380 tons of explosives, 12 billion U.S. taxpayer dollars, & 300,000 barrels a day for four years of Iraqi crude oil. Finally, Buck Henry stopped by to talk about Rupert Murdoch who purchased Dow Jones for $5 billion, which is also the company that owns the Wall Street Journal in a segment called "The Henry Stops Here".