Nearly a year later, Benghazi remains a flashpoint in Washington for two very different reasons: indefensible pre-attack policy decisions and irresistible post-attack politics.
The Obama White House, from the president on down, complains of "phony" Republican-led congressional investigations. Yet the administration's own reluctant, and at times inaccurate, responses to congressional inquiries have contributed to the GOP charge that the administration, at a minimum, has been less than transparent.
"We need to get to the bottom of what happened that terrible night, why it happened, and how we can prevent similar tragedies in the future," House Speaker John Boehner said last week in serving notice the House Benghazi investigations would continue into the fall, and include new subpoenas for documents and testimony if necessary.
There are legitimate questions about why repeated and specific warnings about the Benghazi security situation were undervalued or ignored. Both lawmakers and intelligence professionals point to this weekend's unprecedented wave of Middle East and Africa embassy closings as, at least in part, a lesson learned from the September 11, 2012, attack that killed Ambassador Chris Stevens and three other Americans.
Republicans, however, have at times undermined their own claim to be interested only in legitimate congressional oversight, not what Democrats often label a partisan witch-hunt.
Boehner, for example, has at times privately urged lawmakers leading the investigations to focus on what the evidence shows -- and not let their partisan instincts allow their public rhetoric to get out ahead of the facts.
Also undermining the GOP effort: fund-raising e-mails and videos from Republican and conservative groups asserting a Benghazi cover up orchestrated by President Barack Obama and then-Secretary of State Hillary Clinton.
"You've got a very valid point," Rep. Darrell Issa, chairman of the committee leading the House Benghazi review told CNN in an interview for "The Truth About Benghazi," a one-hour program looking at the attack and at the lingering policy and political questions. "I would prefer that fund-raising by outside groups stay away from the hard work of Congress.
"But it isn't going to happen."
Early 2016 jockeying also factors into the politics.
Kentucky GOP Sen. Rand Paul says Clinton is responsible for the sub-par security in Benghazi even if, as she says, the stream of warnings and requests for more personnel never reached her desk.
"That's precisely her culpability," Paul told CNN. "When you lead the State Department, decisions in one of the most dangerous countries in the world should rise to your level. That's your job to make sure those messages get to you."
GOP strategist Kristen Soltis Anderson understands the GOP effort to use Benghazi to tarnish Clinton's image, but describes her as the most "formidable" Democratic 2016 hope and adds, "I don't know that Benghazi alone would sink a Clinton candidacy for president."
And if the attacks now are somehow designed to discourage Clinton from running, veteran Democratic strategist and Clinton ally Paul Begala suggests an opposite reaction.
"She's never been a person to back to down to a bully," Begala said in an interview. "Hillary is the type of person to be motivated by that. To stand up and fight back."
Benghazi politics often get more attention because of the personalities involved. But there is also a policy divide.
Republicans say they do not yet have a full picture of three critical issues:
• Why the warnings didn't reach the point where the State Department either sent more security help or ordered the Benghazi mission closed.
• Why, especially given the weeks of threat warnings, there was no viable military option to assist the State Department personnel at the Benghazi mission and the predominantly CIA-run annex that came under attack later same evening and where two of the four Americans were killed.
• And why, nearly a year later, no one has been brought to justice.
New FBI Director James Comey is being pressed to update Congress on the investigation within a month of his officially beginning work next month.
On the military response question, the Pentagon now says it is making significant improvements in its contingency planning for responding to embassies in danger zones.
But former Pentagon brass told Congress there was no viable option that night, with then-Defense Secretary Leon Panetta saying the military "should not be a 911 service capable of being on the scene within minutes."
The top Democrat on the House Armed Services Committee, Rep. Adam Smith of Washington, calls Benghazi a tragedy but labels continued GOP questioning a witch hunt.
"The bottom line is there was not a force available that could get there in time," Smith told CNN. "So I don't think these questions need to be asked again."