As other videos of him making the exact same gestures in regards to his showing other people (Ted Cruz, a general, etc.) being flustered show.
You know, this is why I can't stomach so many people on the left - you are so intellectually dishonest with your wrong conclusions, double standards, hypocrisy, etc. The sad part is the left actually has some good points with things like income inequality and the Republicans' obsession with making sure the rich get richer, along with some social positions. But it gets lost in the tactics you use, which are so vicious and mean-spirited and hate-filled it makes the typical conservative look like a saint.