The coronavirus outbreak is colliding with the presidential election and the ramifications are being felt on the campaign trail and at polling places. “Campaigning and conventions could change,” said Rick Hasen, an election law expert at the University of California, Irvine’s law school, raising the possibility of virtual nominating conventions this summer if the outbreak continues. The effects were clear Tuesday night, when former vice president Joe Biden and Vermont Senator Bernie Sanders both canceled election night rallies in Cleveland after Ohio’s governor discouraged large gatherings. On Wednesday, Biden’s campaign said it had formed a six-person public health advisory committee to provide “expert advice regarding steps the campaign should take to minimize health risks for the candidate, staff, and supporters.” After consulting with those experts and at the request of local officials, the Biden campaign announced it was shifting “large crowd” events scheduled for Friday in Chicago and Monday in Miami to “virtual events.” And after initially resisting changing Trump’s schedule, the White House and his campaign on Wednesday night cancelled or postponed three upcoming events. At the same time, state election officials are taking steps to adjust voting procedures to keep the virus from spreading. Washington state told voters not to lick the envelopes of their absentee ballots, Ohio is moving polling places for next Tuesday’s primary from senior centers to avoid infecting older people, and Chicago will make paper ballots available for voters who don’t want to use touch screen machines in the Illinois primary, also next week.