Brian Mast is a veteran who lost both his legs to an IED in Afghanistan. In 2016, we endorsed him when he ran for the House. Happily, he won, and now represents Florida’s 18th District. Now, a Floridian who is active in the Democratic Party is under arrest for threatening to kill Mast’s children: Laurence Wayne Key, a volunteer for the Democratic Party of Martin County, Florida, has been arrested after he allegedly made a call to Rep. Brian Mast’s (R-Fla.) Washington, D.C. office and threatened to kill his kids over the situation at the border. “I’m going to find...