Republicans are about to take a leap of faith. Their presumptive nominee is familiar. This will be the third consecutive election in which former President Donald Trump is their standard-bearer in the race for the White House. But the situation is unprecedented. Trump faces 91 criminal counts across four cases in multiple jurisdictions. He is facing civil judgments that threaten his vast business empire and personal fortune. Nevertheless, Trump is seeking to become only the second president elected to nonconsecutive terms (the first being Grover Cleveland) and also the second to take office older than Ronald Reagan when he left (the first being Joe Biden, the incumbent). While facing unprecedented legal headwinds, Trump remains weighed down by the same baggage that plagued his last two presidential campaigns. He is broadly unpopular, especially among college-educated suburban...