Passionate Unionists in both the Tory and Labour parties are lining up a series of amendments designed to limit Alex Salmond's freedom of movement.

BBC: Scottish independence: Does it take two to separate?

But already, interest groups are lining up with a series of ad blitzes to sway members of Congress, including the National Association of Manufacturers, the League of Conservation Voters, Americans for Change and the American Values Network.

CNN: Health care not Congress' only priority