Heartbroken fans are wishing Jon Stewart a "jonvoyage" on Twitter, but Donald Trump and the other 2016 U.S. presidential candidates may be breathing a sigh of relief. Stewart steps down from "The Daily Show" on Thursday after 16 years of biting political and media satire just as the presidential election campaign - a comedy gold mine - heats up. Trump, the billionaire businessman turned Republican Party White House contender, has become Stewart's favorite target as his tenure