Alan Huffman and Michael Rejebian have spent the past 18 years doing “oppo” work: the tedious and delicate task of going through public documents about political candidates. The two have co-authored a new book titled “We’re with Nobody: Two Insiders Reveal the Dark Side of American Politics,” which is peppered with anecdotes about wrangling these files from obstructionist clerks – but never reveals the names of any of their clients.