This excerpt from a very interesting website by Gordon T. Long:

07-08-10 EXTEND & PRETEND: Stage I Comes to an End!
Both came to an end at the same time: the administration’s policy to Extend & Pretend has run out of time as has the patience of the US electorate with the government’s Keynesian economic policy responses. Desperate last gasp attempts are to be fully expected, but any chance of success is rapidly diminishing.

We can safely conclude either:

1-    The administration completely under estimated the extent of the economic crisis, even though we were well into it when the ARRA was introduced.

2-    The administration was unable to secure the actually required stimulus amount which was likely 4-5 times that approved.

3-    The administration failed to implement the program in a timely manner.

4-    The administration failed to diagnose the problem correctly and that in fact it is a structural problem versus a cyclical and liquidity problem, as they still insist it to be.

I personally believe it is all four of the above.