George Will wonders whether the Romney lead will be evanescent. Which depends on what the meaning of inchoate is.
If it is durable, it will be because I think usually what happens in debates that matter is they catalyze an inchoate feeling the electorate had and that and that it becomes articulate and present and powerful.
Inchoate means 'Just begun and so not fully formed or developed.' Evanescent means 'Soon passing out of sight, memory, or existence; quickly fading or disappearing.'