If a tree falls in the forest — or, as the case may be, if Joe Biden conducts a virtual town hall — and there’s no one to hear it, does it make any noise?
With rallies and other live events frozen by the pandemic, the presidential campaign is limited to news coverage (so-called earned media), paid ads and, importantly, social media. As Barack Obama proved in 2008 and 2012, and Donald Trump demonstr…
