Tyler Cowen is not a fan of a second stimulus:
We've just seen what special interest groups have done to legislation on health care reform and climate change and neither has even reached the Senate yet. Round one of the stimulus represented the high water mark of the influence of the technocrats in the Obama administration. What do you think round two of the stimulus would look like?
I'll also note this: even if you think the pro-stimulus forces are correct, they are losing the rhetorical battle rapidly. American voters do not in fact have the patience for a lot of good ideas.