How a single rogue elector could flip the presidential election

Joe Biden and Donald Trump are neck and neck in national polls. Biden doesn’t need to win as many states as he did last time to be reelected. That’s a good thing for the Biden campaign, because he almost certainly won’t. 

Trump is ahead by 4 percentage points or more in Georgia, Arizona, North Carolina and Nevada, all crucial swing states, according to RCP averages. Biden’s best hope for reelection is through a clean sweep of the Rust Belt: Michigan, Wisconsin and Pennsylvania. He has a decent chance to do just that...