How will the plague affect this season’s campaigns? Let’s count the ways.

Governing itself is an indoor affair and a behind-the-scenes matter, but running for office is a true contact sport, involving flesh pressed and hands shaken, babies adored at close range, people massing in rallies (the bigger, the better), running mates embracing each other in moments of triumph, and young people taking time off from their classes to knock upon strange people’s doors.