A Vermont Republican legislator who faced bipartisan condemnation after participating in a long-running group chat that was peppered with racist and antisemitic language announced on Friday that he would resign. State Senator Samuel Douglass, 26, was one of a dozen young Republican Party activists from around the country who had participated in the texts, which were first reported on Tuesday by Politico. And while some participants worked for Republican lawmakers or held government posts, Mr. Douglass was the only elected official. “I know that this decision will upset many, and delight others, but in this political climate I must keep...