It’s easy to laugh at Joe Biden’s incoherence during Wednesday night’s town hall in Cincinnati, Ohio. The hall was at least half empty, a stone-faced Don Lemon struggled not to giggle or burst into tears (I couldn’t tell which), and Biden’s word soup was worse even than it usually is. But Deb Heine, one of the most astute conservative writers, tweeted out something very important that made me realize that Joe, no matter how quickly he’s decomposing, is still acting as a mouthpiece telling us what our future holds. The stories about Biden’s serious mental lapses are all over the...