What Clinton's DNC Speech Means

Reactions to Bill Clinton's speech at the Democrat National Convention the other evening were what you'd expect.  Democrats called it, "amazing", "awesome", "fantastic", and "best speech ever".  Republicans called it, "boring", "rehash", "overly wonky", "sprawling", and "a giant swing and a miss".  


Personally speaking, I'm still trying to figure out what he meant every time he used the word "is".