Donald Trump's debate is shaping up to be an awfully lonely affair. Rick Perry became the latest candidate to bow out today, joining Mitt Romney, Ron Paul, and Jon Huntsman in skipping the Dec. 27 event. Perry's campaign was polite to Trump in its refusal, saying that the governor "respects him and the folks at NewsMax very much," but that ahead of the Iowa caucuses, old-fashioned "retail" politics is his "top priority." It also noted that two other debates take place over the next week. (More Donald Trump stories.)