Hey, um, Senator? It's not like there's anything on the line here, you know. Just the future of the greatest nation on the face of the planet ever, as well as your children's and grandchildren's future.
My instinct tells me he dropped out more because of the Ensign scandal than not wanting to roll up his sleeves. If he dropped out to keep an unwanted distraction out of the proceedings, then I'm wrong and I apologize. If that's why he left the Group of Six, however, he should have come up with a better excuse than blaming the other five men.