Why did Paul Ryan drink water during the debate?

Well since you asked Bill Maher, because he could!

@billmaher @rsmccain.Ryan drank water because his prostate still works, unlike Biden who would have had to call a bathroom break.
— Evi L. Bloggerlady (@MsEBL) October 12, 2012

Maybe Biden was such a grinning fool because he was holding it?   Well that and the fact Biden was flat out lying.