<p>Did the buttoned-down billionaire David Koch engage in a spirited bit of political trash talking to Hillary Clinton back in 2014?</p><p>Koch met Clinton at a New York gala at the Central Park Zoo. What happened next is now a topic of dispute. </p><p>“Hillary was her gracious self; Koch, not so much,” wrote Clinton <a href="http://www.politico.com/story/2014/03/david-brock-bill-clinton-hillary-clinton-104976">antagonist-turned-enforcer</a> David Brock in a <a href="http://www.politico.com/story/2015/09/david-brock-new-york-times-book-review-213888">recently released book</a> called “Killing the Messenger; The Right-Wing Plot to Derail Hillary and Hijack Your Government.”</p><p>Brock wrote that Koch, the billionaire who helms a network expected to spend <a href="http://www.politico.com/story/2015/01/koch-2016-spending-goal-114604">hundreds of millions</a> of dollars attacking Clinton's presidential campaign and those of other Democratic candidates, " expressed admiration for (Clinton’s) service as secretary of state.” But, in Brock’s brief account, Koch pivots quickly from small talk, explaining gruffly, “I’m going to spend a lot of money to defeat you” before “turning on his heels and vanishing into the crowd.”</p><p>On Thursday, the gala's host remembered a much friendlier conversation.</p><p>“Mr.