One intriguing possibility, if Obama doesn't target a single state or try to amplify the change message: Sen. Jack Reed of Rhode Island. That state's four reliably Democratic electoral votes aren't in doubt and Reed is unknown nationally, but he could help Obama in several ways.
He's a Catholic with working-class roots (his father was a school janitor), and could enhance the ticket's appeal to those swing voters. He has expertise on issues at the center of the campaign debate, economics and the housing crisis.
More important, he would offset Obama's lack of national security experience. Reed, 58, has a reputation as a serious thinker and is a respected voice on defense matters. He's a West Point graduate and Army Ranger, with views that are right in line with Obama's. He voted against the 2002 Iraq war resolution and became an early critic of the way the war was fought while working to increase the size of the Army.
However, just like all of the potential vice presidential candidates, he says he's not interested.Reed is certainly aligned with Obama on the war in Iraq.