Brad pretty much nailed it. All I would add is that this was covered up by the video primarily because Obama was in the middle of re-election and Hiliary (pronounced Hill-LIAR'-ee) was planning on running. They didn't want to take any responsibility for what happened and so geopardizee their elections, and guess what...it worked.
There is a deeper more profound reason however that Hiliary promoted the LIE that it was a video. She is a psychopathic LIAR and anytime she has ever been given the choice between lying to gain an advantage and telling the truth she has always chosen to lie, It's no secret. From her early days in the Democrat party investigating Watergate to her most recent scandal, one of many throughout her career, the email fiasco.
Odd however, videos do seem to be her downfall. Remember the “Dodging Sniper Fire in Bosnia” Tale? Yeah, she got caught in the middle of that whopper forgetting there was video of her landing and the "reception" Bosnians threw for her which she said was cancelled because of the "dangerous circumstances".
Why did she make up this story? In the primary Obama's team was casting doubt on her foreign policy experience (like Obama had any?) so she felt she had to come up with a lie to strengthen her global bonifides. She bragged about the Bosnia landing and Sharyl Attkisson researched it and exposed her. Hiliary then tried to make the excuse that she misspoke because she was sleep deprived but then videos surfaced of her making the same Bosnia sniper fire claim on other occasions. What a pathetic LIAR, she even involved her teenage daughter in her lie, Chelsea was right there with her, Hiliary greeting children (which Hiliary lied about) and Chelsea obviously having a great time. Just watch this!
Oh wait, my gravest apologies to all you Hiliary zombies out there. It appears this Hillary WASN'T LYING! Bosnia gunfire footage discovered...https://www.youtube.com/watch?v=uHVEDq6RVXc
But that won't change this fact, she is a pathological LIAR and an embarrassment to her gender. https://www.youtube.com/watch?v=-dY77j6uBHI
Were any men to judge womanhood by her example they'd be carrying a cross, holy water and a wooden stake to any place there were women. If a Republican, they'd also carry a weapon loaded with silver bullets.