Sign up for the Slatest to get the most insightful analysis, criticism, and advice out there, delivered to your inbox daily. Here’s what we know about the attack at the White House Correspondents’ Dinner on Saturday night: A man carrying two firearms tried to charge the event. He failed to kill anyone. Federal authorities are charging Cole Allen, a 31-year-old man from California, with firearm and assault charges, and they may add more as the investigation continues. We do not yet fully understand the suspect’s motivations, but we have strong indications. He had donated to Kamala Harris’ presidential campaign, he...