And there's some evidence to suggest they're right  -- namely Trump himself. Trump's GOP opponents in the 2016 race spent the entire campaign insisting that in nominating the controversial billionaire the party would be forgoing its chances of beating Hillary Clinton in the general election. Then, Trump won. So long, electability!

Biden's lead over Trump is explained, somewhat, by the fact that Biden is a wholly known commodity on the national stage -- the result of eight years as Barack Obama's vice president and more than three decades of service in the Senate. Biden is also known -- even by independents and lean-Republicans -- as a centrist, unlike, say, Sanders, who has unapologetically embraced every imaginable tenet of liberalism.

While the next eight months(ish) will decide the electability question vis-a-vis Biden, the takeaway from the Post-ABC poll -- or at least one of the takeaways -- should be that Trump isn't going to be a pushover in November 2020.