President Obama's campaign launches a new TV ad Monday targeting Republican Mitt Romney's comments about Americans who don't pay taxes.Romney says Obama is misrepresenting his record and viewpoints.Doctors at the National Zoo are trying to figure out why a giant panda cub born barely a week ago suddenly died on Sunday.Preliminary findings of the examination are expected on Monday.The leaders of more than 120 nations gather in New York this week for the United Nations general assembly.Top issues are expected to include the uprising in Syria and tensions over Iran's nuclear program.And, "Homeland" won the Emmy Award for the best drama Sunday night. "Modern Family" was named best comedy.
