Viva la homework revolución

The problem with not understanding much is that we don't understand much. We're not from America but we do watch American television. We know who Barack Obama is but we don't know what his "Do your homework" speech is. We presume it's not a speech encouraging kids not to do their homework. Our regular reader from America told us about his kids before and after the President gave his speech. We're not clever enough to know what it means because we never done our homework but some of you might know what it means: