He got sick on a flight to Cleveland. If he was feeling good enough, he would probably have followed that setup line with the requisite "second prize: two weeks in Philadelphia" line. (No no, we kid because we love. My forbears are from Philly; my wife grew up in Vermilion, outside Cleveland.)
It is wonderful that Carter was in such good form one week ago for his appearance with Jon Stewart. Indeed, Stewart started the show by remarking how fresh and peppy Carter looked. Carter is tough, as no one should ever have doubted, and I hope he is back on the book-promo trail soon.