CLEVELAND—Reacting reflexively to the Indiana governor’s speech while watching a live feed backstage at the Republican National Convention, GOP presidential nominee Donald Trump accidentally shot off a “Boring Mike Pence” tweet Wednesday night before he could stop himself. “Boring Mike Pence lacks any charisma or charm,” Trump’s tweet about his running mate read in part, adding that the Tea Party–aligned conservative was a “total disaster” and “very hard to watch.” “Doing a lousy job. Knows nothing about winning. Pathetic.” Trump, who reportedly noticed that the social media post had quickly received over 10,000 retweets, instinctively fired off three more tweets questioning Pence’s fitness for vice president.