WaPo:

When asked what kept him up at night, Ben Wikler, who is responsible for delivering a must-win state in November as chairman of the Wisconsin Democratic Party, used to answer, “unknown unknowns.” He no longer has to wonder what such a risk might look like.

Presidential campaigns, parties and state election officials are scrambling to heed health warnings while safeguarding the democratic process against a growing coronavirus epidemic whose scope is difficult to predict.

Their planning has included advising voters not to lick their mail-in ballots, relocating polling places away from senior living communities, and weighing whether to move forward with plans to bring tens of thousands of visitors from around the world to Milwaukee and Charlotte for the planned Democratic and Republican summer conventions, respectively.