Source: Gary Strauss / USA Today U.S. stocks sank in a stomach-churning panic Monday, following market meltdowns in Asia and Europe, as last week's downgrade of the USA's credit rating reverberated around the world. If investors were looking for assurance from President Obama, they didn't find it. His attempts to assauge skittish investors during a mid-afternoon televised speech appeared to accelerate the losses. Before he spoke, the Dow Jones industrial average was down about 385 points; following his remarks, the [...]