WASHINGTON—As former Vice President Joe Biden and Vermont Sen. Bernie Sanders square off for a third straight Tuesday of big primary contests, the coronavirus pandemic is increasingly pulling the attention of Americans away from the Democratic presidential race and causing uncertainty around voting.

Republican Ohio Gov. Mike DeWine recommended Monday postponing in-person voting in his state from Tuesday until June and extending the vote-by-mail period, saying a lawsuit would be filed and a judge would have to determine whether…

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