What a joke. $100 in unemployment benefits can be spent at a grocery store, which, in turn, can use that $100 to pay salaries and support other jobs. The total amount of additional economic activity will be well above $100; but because government borrows the $100, that same money is now unavailable to the private sector--which would have spent the same $100 with the same multiplier effect.
Consider a more comprehensive example. A family might normally put its $10,000 savings in a CD at the local bank. The bank would then lend that $10,000 to the local hardware store, which would then recycle that spending around the town, supporting local jobs. Suppose that the family instead buys a $10,000 government bond that funds the stimulus bill. Washington spends that $10,000 in a different town, supporting jobs there instead. The stimulus has not created new spending, jobs, or a multiplier effect. It has merely moved them to a new town.
This whole Keynesian balony about how "new" spending of $1 will create $1.50 in economic benefits simply cannot explain why the massive government spending to the tune of (just for example) 1.5 trillion has not created 3 trillion in new economic growth.