The Author said "So Obama will spend upwards of a trillion dollars of stimulus in a combination of tax cuts, building roads, bridges, and hopefully public transportation. And it can't hurt and maybe it will help." I can think of plenty of ways this could hurt.
Obama could create new entitlements that burden America for generations. The money could be used to prop up failing businesses, creating a situation where success is determined by who has the best lobbyists.
Not every loan is a bad idea, but plenty of them are. There is no guarantee the effect of this loan will be positive.