Today’s market opened up a tad on positive action from Asian and European markets; however, the pangs of last week’s painful performance took hold and the S&P 500 fell as much as 0.7%.  Earnings and revenues for Caterpillar (CAT) were below estimates causing investors to recall flat to poor results from General Electric (GE), International Business Machines (IBM) and McDonalds (MCD) on Friday.  Then, shortly into today’s session, Existing Home Sales o