Cycles in presidential campaigns begin with hopeful conjecture, outright lies, blind tabloid items that can’t ever be proved or disproved. This week the Marco Rubio cycle began. Marco Rubio is now the “front-runner” for the Koch brothers’ support and cash, the New York Daily News reported yesterday morning, citing a source “who ran into David Koch at a recent event in Manhattan.” That sourcing sounds pretty shaky — David Koch has never seemed like someone who blurts out his political plans to the restroom attendant, though, who knows, people always surprise you — but of course it’s hard to imagine...