By Roberta Rampton EVANSTON, Ill. (Reuters) - President Barack Obama tried on Thursday to turn the spotlight on the eco**my, the issue U.S. voters care about most ahead of **vember midterm elections, making the case that his policies have steered the country away from the brink of collapse and laid a foundation for growth. *** It's the second take for a strategy that the White House rolled out in June, only to have its optimistic message drowned out by crises in Iraq, Syria, Ukraine and western Africa. ...