Description:President Barack Obama said it's \"absolutely imperative\" that authorities investigate the death of Trayvon Martin as thoroughly as possible and expressed sympathy for the Florida teenager's parents. Meanwhile, government-backed mortgage financiers Fannie Mae and Freddie Mac have concluded they could save money through \"loan forgiveness\" to beleaguered homeowners, reducing the amount of principal they owe on their federally insured loans. And finally, U.S. President Barack Obama on Friday nom(3:28)