Every day, 14 retired teachers and other school employees arrive at the Philadelphia Federation of Teachers' headquarters and go to work for Hillary Rodham Clinton. The retirees--working with volunteers and union staff members from as far away as Alaska--are working to inform teachers' union members why the American Federation of Teachers (AFT) favors the New York senator for the Democratic presidential nomination over Senator Barack Obama of Illinois. According to Ted Kirsch, the president of the 36,000-member AFT Pennsylvania, Obama and Clinton are very close on most issues, however, there is a clear difference on the issue of education. Senator Clinton has been more emphatic about overhauling the No Child Left Behind Act and has opposed merit pay for teachers. On the other hand, Obama did not "have a clear position" on the federal law when AFT leaders interviewed him last year. Political experts question whether Obama's and Clinton's different take on education will matter much for teachers voting next week in the Pennsylvania primary. In Pennsylvania, polls are finding that voters are choosing the candidates based largely on personal appeal.