Don't miss this preview of the rollercoaster season we have coming your way. We are swinging for the fences, and we'll probably gain a few enemies along the way. That's how we know we're doing our jobs right!

Forty-three men between 1789 and 2017 demonstrated the awesome and growing power of the American presidency. Sometimes they were blunt, other times much more deliberate. But in 2017, something shifted, and since then we've seen how extremely fragile the presidency is, too. The two men who've held the office since then have exposed its frailty over and over again. One battered norms with open contempt, mistaking spectacle for strength and grievance for governance. He treated institutions as obstacles to be humiliated into submission. The other stretched executive authority past its snapping point in the name of restoration, governing through emergency and exception. Then that first guy came back, but worse, and that's where we are now. Whether through chaos or consolidation, they both marked radical departures from the managerial, post-Cold War presidency. They weren't course corrections -- they were disruptions. Joe Biden and Donald Trump: the Aberration.

Part 2 of 2: Daddy left unfinished business in the Middle East, so Bush 43 comes to the White House in 2001 with a mission, and whether he accomplished it or not really isn't up for debate -- he didn't. That didn't stop him though, and the damage he did in the White House made his successor's election seem like salvation may have arrived. Spoiler alert: it didn't. The White House is where altruism goes to die. And the first Black president in American history revealed something ugly in this country, paving the way for horrors to come. Part 2 of the Accelerants -- George "Dubya" Bush and Barack Obama.