In 2016 the board did not endorse either Hillary Clinton of Donald Trump. It did, however, ask its readers in 2016 to not vote for Trump.
In making the endorsement USA Today reported:
Four years ago, the Editorial Board — an ideologically and demographically diverse group of journalists that is separate from the news staff and operates by consensus — broke with tradition and took sides in the presidential race for the first time since USA TODAY was founded in 1982.
We urged readers not to vote for Donald Trump, calling the Republican nominee unfit for office because he lacked the “temperament, knowledge, steadiness and honesty that America needs from its presidents.”
We stopped short, however, of an outright endorsement of Hillary Clinton, the Democratic nominee. This year, the Editorial Board unanimously supports the election of Joe Biden, who offers a shaken nation a harbor of calm and competence.