Here is why. . .
in a nutshell only the POTUS could have OK'd the rescue of the folks in Libya. . . his failure to act, or to actively say no to the rescue is the same, no help could be sent over the border . . .
Obama owns it. He caused the deaths of at lease the SEALS if not all four Americans there with his failure to do his job and respond in a crisis. . . and an embassy under attack is a crisis folks deal with it.