A simple exercise, based on public statements and some reporting.
Confirmed
Sen. Chris Dodd
Almost certainly being vetted (based on my and other's reporting)
Gov. Tim Kaine
Gov. Kathleen Sebelius
Sen. Evan Bayh
Unknown
Sen. Chuck Hagel
Sen. Hillary Clinton
Sen. Claire McCaskill
Ex-Sen. Sam Nunn
Ex-Sen. Tom Daschle
Ex-Sen. John Edwards
Not being vetted
Sen. Jack Reed
Sen. Joe Biden (yet)
Ex-Rep. Dick Gephardt
Sen. Jim Webb
Ex-Gen. Colin Powell
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Marc Ambinder is a contributing editor at The Atlantic. He is also a senior contributor at Defense One, a contributing editor at GQ, and a regular contributor at The Week.