Here is an Obama 2 minute ad entitled Defining Moment that is specific about what change would look like after four years of an Obama administration. The question he begins by posing is...Will the country be better off four years from now? He then goes into his policy proposals.
The ad is simple, clear and direct. It captures his temperament and his coolness. It addresses his policy proposals and how he intends to pay for it. It's all there.
Off to bed...so I cannot provide a transcript at this time.
UPDATE
Here is a transcript provided by AtomikNY.