Right from the moment he stepped into the building, we could see that Jon Stewart felt awful. Stewart was paler than pale. He'd been sick with stomach flu, and as you can see here, the guy totally toughed it out.
His hour with Rachel Maddow would be the longest period he'd gone without being sick in a day. At the close of the interview he said to Maddow:
"You, my friend, are like ginger root. You are the ginger root of interviewers, in that you have pulled things out of me I never knew were there, and yet, still I leave not nauseous."
It was an amazing encounter, and we'll have lots and lots of it on the show tonight at 9 Eastern.