It’s generally understood that when newspaper editorial boards endorse candidates, they do so as late as possible in order to avoid the perception that their news coverage will be slanted in favor of the endorsee. So I was surprised to see The Boston Globe endorse U.S. Sen. Ed Markey over his Democratic primary challenger, U.S. Rep. Joe Kennedy, a full five weeks before the primary.

What gives? According to the Globe’s editorial-page editor, Bina Venkataraman, it’s later than it seems: mail-in voting will begin soon, so the Sept. 1 primary date is merely the last day that people can cast ballots. I’d honestly forgotten that, even though I’ve applied to vote by mail.

In fact, as David Bernstein recently pointed out at WGBH News, the two campaigns are engaged in furious get-out-the-vote efforts already. Huge numbers of Massachusetts voters are expected to take advantage of the mail-in option in order to avoid exposure to COVID-19 at the polls.

There’s still a dilemma, though. Because Markey and Kennedy will be campaigning right up until Sept. 1, the Globe’s news reporters will have to fend of complaints of bias for more than a month. The editorial pages at a quality paper like the Globe do not affect news coverage (for example), but try explaining that to the general public.

Should newspapers endorse candidates at all, or is that an outmoded custom? I’ve found that my students are dubious about the merits of news organizations’ telling people whom to vote for. But I think it can be a valuable exercise, especially in situations where an endorsement might really make a difference.

In this case, the Globe endorsement might matter. Markey and Kennedy hold similar progressive views, and readers will sit up and take notice that the Globe isn’t endorsing a Kennedy, as they might have been expected to do — although, as a longtime Globe reader, I can’t say I was all that surprised that they went with Markey.

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