COLUMBUS, Ohio — Joe Biden won Ohio’s presidential primary Tuesday, clinching a contest that was less about the Democratic nomination and more about how states can conduct elections in the era of the coronavirus.

The primary was the first major test of statewide elections via mail amid an outbreak. And the results were mixed.

There were reports of confusion but no widespread disruption. It wasn’t like Wisconsin earlier this month, when voters were forced to overlook social distancing guidelines to stand in line wearing masks to cast ballots.

Still, overall turnout appeared to be off. The secretary of state’s office said that about 1.5 million votes had been cast as of midday Saturday, down sharply from the 3.2 million cast in Ohio’s 2016 presidential primary.

“Within the context of the threat of the virus, it’s a decision that we will have made the best of,” Republican Ken Blackwell, a former Ohio elections chief who chairs the bipartisan International Foundation for Electoral Systems, said of mail-in balloting.

The primary, originally scheduled for March 17, was delayed just hours before polls were supposed to open. Citing a “health emergency,” Republican Gov. Mike DeWine recommended that in-person balloting not be held until June 2. But amid legal challenges, officials moved balloting to this week while converting to a mail-in process since the state remains under a stay-at-home order.

Most Ohioans casting absentee ballots had to run at least three pieces of mail — an application, a blank ballot and a completed one — through the U.S. Postal Service. Homeless and disabled people were allowed to cast in-person ballots at county election board offices, as were voters not receiving ballots by mail in time to participate.

Lynne Marshall of Sylvania, Ohio, opened her mailbox Tuesday and was disappointed to see that her ballot had not arrived after a monthlong wait and countless calls to the state and local election offices. She then agonized over whether to cast a vote in person.

“I don’t know what to do,” she said. “I’m just really disgusted with it all. Of course, I’ll feel guilty if I don’t vote.”

With his last competitor, Vermont Sen. Bernie Sanders, suspending his campaign weeks ago, Biden has emerged as the presumptive Democratic presidential nominee, and the Ohio results were never in doubt.

Still, moving to a mail-in primary on the fly was watched around the country as states with upcoming elections grapple with how to allow voting while battling the coronavirus’ spread.

States have taken drastically different approaches to elections during the pandemic.

New York said Monday that it would cancel its June presidential primary.

Wisconsin, over warnings from the governor and public health experts, proceeded with in-person balloting this month and now is reporting that more than 50 people who voted in person or worked the polls have tested positive for the coronavirus.

Some governors have suggested that they would consider moving to an all-mail voting system for the November general election, something President Trump has strongly opposed.

Maryland was also balancing balloting and voter safety on Tuesday as polling centers opened to conduct a special election to finish the term of the late Rep. Elijah E. Cummings (D-Md.).

Most of the focus, though, was on Ohio, which also held congressional primaries. It’s traditionally a battleground state that has voted more consistently Republican in recent cycles. Trump won it by 8 percentage points in 2016, after President Obama, with Biden as his running mate, carried the state twice.

In Wisconsin, the state Department of Health Services reported the possible polling-linked coronavirus figures on Tuesday, three weeks after the April 7 presidential primary and spring election that drew widespread concern because of voters waiting in long lines to cast ballots in Milwaukee. Democratic Gov. Tony Evers tried to move to a mail-order election but was blocked by the Republican Legislature and conservative-controlled Wisconsin Supreme Court.

Several of the 52 people who have tested positive and were at the polls also reported other possible exposures, said Wisconsin Emergency Management spokesman Andrew Beckett. Most of the positive cases were in Milwaukee County.