NEW YORK (Reuters) – “Democratic presidential candidate Barack Obama called on Thursday for a second economic stimulus package of $30 billion and for greater oversight of the U.S. financial system to prevent another housing crisis. “First, this plan is not much different from those proposed by all candidates. I have no ax to grind with Mr. Obama. But, I doubt he has $30 billion he is planning to inject into the economy. Neither do any of the other candidates. So where does the money come from? The United States Government produces no income. They have only the money they take from you. Most of the people in trouble now are…