As Barack Obama takes off for his first overseas trip as president, a new national poll indicates that more than eight in 10 Americans think he will do a good job representing the United States to the world. And seven in 10 people questioned in the CNN/Opinion Research Corporation survey, released Tuesday, believe that leaders of other countries respect Obama. The CNN/Opinion Research Corporation poll was conducted March 12-15, with 1,019 adult Americans questioned by telephone. The survey's sampling error is plus or minus three percentage points.