During the year 2015, major news outlets covered Donald Trump in a way that was unusual given his low initial polling numbers—a high volume of media coverage preceded Trump’s rise in the polls. Trump’s coverage was positive in tone—he received far more “good press” than “bad press.” The volume and tone of the coverage helped propel Trump to the top of Republican polls.

…Bernie Sanders’ campaign was largely ignored in the early months but, as it began to get coverage, it was overwhelmingly positive in tone. Sanders’ coverage in 2015 was the most favorable of any of the top candidates, Republican or Democratic. For her part, Hillary Clinton had by far the most negative coverage of any candidate. In 11 of the 12 months, her “bad news” outpaced her “good news,” usually by a wide margin, contributing to the increase in her unfavorable poll ratings in 2015.

Pre-Primary News Coverage of the 2016 Presidential Race: Trump’s Rise, Sanders’ Emergence, Clinton’s Struggle | Shorenstein Center

Sanders was treated badly by the mainstream press, my ass!