The chief architects of Tuesday's rallies in Egypt are members of the NationalAssociationforChange, a grouping of opposition movements that Mr. ElBaradei assembled around him last summer.
But already, interest groups are lining up with a series of ad blitzes to sway members of Congress, including the NationalAssociation of Manufacturers, the League of Conservation Voters, Americans forChange and the American Values Network.
The NationalAssociation of Schoolmasters Union of Women Teachers (NASUWT) says it is "profoundly sceptical" of the need forchange and the National Union of Teachers remains unconvinced by the proposals.