According to one of the pundits, this might be a risky pick because "Obama-Biden" looks and sounds too much like "Osama bin Laden" (it does?). Another said that Biden adds needed foreign policy experience to the Obama ticket, and helps deflect any charges of "elitism" since Biden only has one house. He lives in Wilmington and commutes to the Senate every day by train.
Joe Lieberman was Al Gore's running mate in 2000 but campaigns for McCain now. Joe Biden was a candidate for President in 2008 but didn't make it past Iowa. He endorsed Obama shortly after he dropped out. I wasn't paying attention during the early Democratic debates, so I missed this Biden zinger about Rudy Giuliani. So that's where "a noun, a verb, and a 9/11" came from!