This may be significant, since USA Today, America's news-lite national paper, has never before endorsed or dis-endorsed any candidate for the Presidency.   That, together with their ordinary right-leaning "even-handedness," gives them credibility with an ill-informed segment of the electorate who might have entertained voting for Trump.   Trump is clearly "unfit" for the Presidency; he's "unfit" for any actual job, but it will suffice if he is deflected from the Presidency.