MANCHESTER, New Hampshire (Reuters) - Even Rick Perry's top advisers thought it was over. After the Texas governor finished fifth in the Iowa caucuses on Tuesday night, Perry's staff and volunteers gathered around the bar in a Des Moines hotel to say goodbyes, drink beer and mourn what appeared to be the end of his quest for the Republican nomination for president. Perry had, after all, just said that he would return to Texas and "reassess" his campaign in a speech that had all the markings of a withdrawal from the race. Only it wasn't. Less than 12 hours later,...