So, from what I gather from various sources:
1. Chris Stevens was posted to Libya as ambassador in July 2012. The facility there was not up to US standards for a consulate, had inadequate security, and there are records of 100's of emails from Ambassador Stevens asking for improvements to security. Those requests were denied or ignored by the State Dept. Mrs. Clinton claims that she had no knowledge of the requests and it wasn't her job to review such requests. "Security professionals" were responsible, but nobody has ever been called on the carpet to answer for, or been fired for, the lack of adequate security.
2. At the time that Stevens arrived, other governments were closing their embassies because of concerns about growing unrest in the area.
3. In the fall of 2012, President Obama was in the midst of his reelection campaign and was touting success in Libya and a general reduction in terrorist activities as achievements of his administration.
4. When the attack in Benghazi occurred, the Obama administration, backed up by the State Department, claimed numerous times that the attack was by a disorganized mob reacting to an internet video. That narrative went on for a couple of weeks despite documented evidence that Mrs. Clinton knew the story was a lie and had made statements to her daughter and the Egyptian government that the attack was well-organized and appeared to be the work of an al Quaida affiliate.
Sure, the Republicans are using this investigation as a means to put pressure on the Clinton campaign, but that doesn't change the fact that an American ambassador and his staff were knowingly placed in harm's way without adequate security and that the ambassador and three other American's died as a result of this fact. As if that weren't bad enough, Mrs. Clinton and her staff knowingly fed the public misinformation about the nature of the attack, apparently in an attempt to assure that the President's reelection bid wasn't derailed. Partisan politics aside, these facts alone would make me question the character of Mrs. Clinton and whether she is someone worthy of the presidency.