Yep, his appearance will just nail a Gropenhagan (is Clinton going?) decision to American policy.
By switching his visit from Dec. 9 to Dec. 18, Obama appears to be betting that his presence can - as he has expressed hope for several times in the past - push the negotiations "over the top" toward an agreement.
Maybe they are "crunching" the numbers just one more time. Gotta get it right, eh?
