The Virus Has Transformed the 2020 Elections. Here’s How.

From the White House to the county courthouse, the coronavirus pandemic has drastically upended the 2020 elections.

Many Democratic leaders now doubt their national party convention will take place as planned in July, while President Trump’s determination to hold the Republican convention could collide with life-and-death realities.

Both Mr. Trump and former Vice President Joseph R. Biden Jr. are wary of holding public events too soon and may not engage in full-fledged campaigning until the summer.

And hundreds of congressional, statewide and local candidates, who are always overshadowed in presidential...