Fluid argument is a DOS term used commonly to denote a negotiating situation whereby two sides do not agree on an item of an issue.  John Kerry is a great illustration of this.  So was Reagan.  Two sides come to a bargaining table, both trying to "reach a concensus" with the full knowledge that the purpose of having a meeting is to schedule another meeting.  Tabling those items of the issue that may need further discussion at a later date.  Fluid.  No total agreement, yet allowing the macro sicheeayshun to play out a little, then making determinations of result using measures of performance to finally clog the system so thouroughly as to spill over into a new President's administration.  Like Iran.