Those obstacles included a recall over allegations of unintended sudden acceleration by Toyota vehicles, a problem that raised questions about the company's quality control, safety measures and customer service.
Obama and other supporters of stronger gun controlmeasures say all possible efforts must be made to address what they call a chronic and growing problem of gun violence, particularly involving vulnerable targets such as students.
The farm, which is popular with families and attracts 2, 000 visitors a day at peak times, said suitable controlmeasures were in place and it would not reopen until it had got to the root of the problem.