This is the final pre-election edition for any weekend show dealing with politics, and tonight that refers to at least two noteworthy ones. The first is this team effort by Showtime and Bloomberg Politics to cover the presidential election campaign in weekly documentary bursts, and show it, from the inside as well as the outside, for the exhausting marathon it is. Mark Halperin, John Heilemann and Mark McKinnon – veteran political reporters or strategists – divide and conquer, covering the competing candidates and other prominent politicians and media figures and networks. The show is unfailingly smart, refreshingly nonpartisan, and, if anything about the 2016 campaign can be described as entertaining, relatively painless to watch –as well as, most weeks, helpfully informative, and sometimes even quietly revelatory.