Why even have a debt ceiling? As long as there are more blank checks in the check book !

http://www.rawstory.com/rs/2011/07/18/moodys-suggests-u-s-eliminate-debt-ceiling/

Why even have a debt ceiling? 
Good Idea lets also take the stripes off the road so we don't know what part of the road we are on, then we can argue with the other driver when we have a head on collision !