Most of these anti-gun liberals could not explain what "semi-automatic" means if you held a gun to their heads. Doubtless this applies to JJ, and probably to Pres. Obama too. To them it is just a word much like 'abracadabra' that they have heard often enough that they are able to repeat it.
Semi-auto goes back a long way. The Mauser C-96 dates to 1896 and is not all that much different from the 'assault-style' weapons that are available today:
Mauser C96 - Wikipedia, the free encyclopedia
John Brownings 1911 semi auto pistol, actually introduced in 1905, remains dominant in shooting competitions to this day. It was created just a few years after Alexander Graham Bell invented the telephone.