According to the Atlantic, the 2016 election is in the same class as the contests of 1860 and 1964, given that Donald Trump "might be the most ostentatiously unqualified major-party candidate in the 227-year history of the American presidency."
But if we're talking about holding sway over undecided or conservative voters — people who won't automatically vote for Clinton, anyway, in other words — then the recommendation of the Atlantic probably doesn't mean much.
Trump has zero daily newspaper endorsements in the general election.
Few, if any, voters pick a candidate based solely on the advice of some news outlet's editorial board. But people on the fence could conceivably be influenced by the fact that a whole bunch of publications that normally back the Republican nominee are refusing to do so.
It is hard to imagine the Atlantic's endorsement, rare as it is, having the same effect.