David Hogg was thrown into the national spotlight after the tragic shooting at Marjory Stoneman Douglas High School on Valentine's Day. Ever since then, Hogg has become one of the faces of the "March for Our Lives" movement, the gun control group that is predominantly made up of Stoneman Douglas survivors. Since Hogg has become a household name, he assumes that he knows anything and everything about guns. Hint: He doesn't. Earlier this week he tweeted out one of the dumbest things he's ever said (and there have been a lot!). According to Hogg, an AR-15 is an "assault weapon"...