Sheriff Larry Dever of Cochise County, Ariz., which sits on the U.S.-Mexico border, says if President Barack Obama were to come and visit that county he would like to take him to visit the grave of rancher Robert Krentz who was shot and killed on his own property in March by an attacker who fled south on foot into Mexico. The attacker shot both Krentz and his dog after Krentz had radioed his brother to tell him he saw an immigrant who appeared to be in trouble and that his brother should notify the Border Patrol.