JD Vance is a relative political unknown. He's been asked to help Donald Trump avenge his loss

Ohio Sen. JD Vance is supposed to help Donald Trump win the Midwest this fall. But almost immediately after he was announced as Trump’s vice presidential pick on Monday, one thing became clear: Vance, a 39-year-old Republican with less than two years in Congress, is barely known among many Republicans even in the swing states Trump hopes he’ll deliver. Trump’s team has less than four months to strengthen Vance’s profile. Already, a collection of political foes — Democrats and Republicans — is working to fill the information void with a series of attacks seizing on Vance’s inexperience in government, his nationalist views and his history of condemning Trump himself.