Why did Paul Ryan drink so much water?

People are asking. Did you not notice that he frequently sipped water? I never noticed Biden drinking water, and at the first debate, I never noticed Romney or Obama drinking water.

What's the best explanation?
	Ryan was nervous, and his throat dried out and needed moisturizing.
	Less experienced with debates, Ryan hasn't learned to resist the normal instinct to drink water.
	Biden, Obama, and Romney have lost normal human instincts.
	Ryan is an athlete and the athlete's body requires consistent hydration.
	The older men restrict water intake to stave off the urge to urinate.
pollcode.com free polls