WASHINGTON (AP) — The night of smoke, chaos, gunfire and grenades that killed four Americans in Benghazi, Libya, is well-documented. Eight months later, it is the decisions made back in Washington that remain murky and in perpetual dispute. Why was a diplomatic outpost left so poorly protected? Should the Pentagon have rushed jets or special forces to the rescue when the assault began? Did President Barack Obama's administration obscure the true nature of the terrorist attack to help him get re-elected? Congressional Republicans are poking for evidence of incompetence and cover-up in the ashes of the Sept. 11 anniversary attack....