Denis McDonough, of the Center for American Progress and former adviser to Sen.

CENTERFORSECURITYPOLICY: Carter 2.0

The US National Security Adviser, Steven Hadley, spoke of "real progress".

BBC: Participants of the summit

As a co-architect of the federal Cash for Clunkers program with the Center for American Progress and the American Council for an Energy-Efficient Economy and adviser to various congressional offices on the issue, it is gratifying to see how quickly it has been adopted by the American people.

CNN: Commentary: Why 'Cash for Clunkers' works