Admitting that the Stimulus bill failed?

Nope.
The Obama administration won't do that.
Instead, they will redefine what their timeline is:

Back in February, with Congress moving swiftly to approve President Obama’s $787 billion stimulus package, White House budget director Peter Orszag said the benefits of the stimulus would “take weeks to months” to be felt.

But now, the council of Economic Advisors to the president is telling us a different story:

“We always knew we were not going to get all that much fiscal impact during the first five to six months. The big impact starts to hit from about now onwards,” Romer said.

Of course, Romer is lying.
This is a chart that they put out a while back. You can find a copy here:

I think the most telling thing is that the unemployment rate was never supposed to go above 8% in 2009. Heck, if the chart is right, the unemployment rate is supposed to be at around 8% towards the 3rd quarter of 2009.

Who thinks that's going to happen?
If anything, the chart seems to be predicting that the unemployment rate would track... well, about where it is now, without all of that pork.

I'm keeping this chart alive. Because I want to see if our unemployment rate strays from it... at all.