Planned or not, the synergy of the first GOP debates and the last episode of Jon Stewart as host of “The Daily Show” was bound to create a sense of loss. The final episode aired after the debates, but it was taped before. So fans assumed that, even though they were going to have a last glimpse of Stewart as host, they weren’t going to benefit from his reaction to the two-ring circus. But then, as we switched channels from Fox News to Comedy Central, we were given a moment of hope: Stewart started the show by telling us that he felt “an obligation to devote the entirety of the last show to our standard post-debate full team coverage.” Yes, we thought, Stewart isn’t abandoning us after all.