"It's interesting..." is a technique that he has adopted in order to buy time to formulate the right answer for the audience he is speaking too.
What's funny is that Rand CONSISTENTLY polls better than ANY politician out there when it comes to relating his message to a large broad-based group of Americans. It also keeps him out of hot water.
The key starts with him preparing the right answer before blurting something out. Watch any respected public speakers throughout history and you will likely notice that they use this technique when answering questions.
This is what a prepared speaker looks like!
www.yaliberty.org - Young Americans for Liberty
www.ivaw.org/operation-recovery - Stop Deploying Traumatized Troops