When President Joe Biden meets former President Donald Trump on the debate stage for the first time in 2024, both men will be seeking a breakthrough in a race that has been deadlocked for months. Given a choice of two extremely familiar and broadly unpopular candidates who have recently served as president, those in the electorate appear to be entrenched in their views. The possibility exists that under these circumstances, and nearly a quarter-century into a period of intense political polarization, the presidential contest will prove impervious to the dynamics of a normal campaign.  (Dean MacAdam for the Washington Examiner) Biden has poured millions of dollars into campaign ads hitting Trump in the battleground states and the poll numbers have barely budged. Trump was knocked off the campaign trail four days a week for a...