Can Obama make up his mind on the value of "shovel-ready" job spending?

Remember just over a year ago when Obama confessed that "'Shovel-ready' was not as shovel-ready as we expected."  Well that was then. Now Obama is back on the old claim: "If we’re investing in roads and bridges, putting some hard hats back to work, getting our steel workers back to work, they got some more money to spend. Maybe they buy that new computer. Maybe they decide to take a little vacation. And all that money circulates in the economy and it makes us all grow."  Of course, there are other problems such as where the money has to come from.