By BILL BARROW and BRIAN SLODYSKO MILWAUKEE (AP) — Republicans were welcoming JD Vance as Donald Trump’s running mate on the same night devoted to blasting President Joe Biden’s leadership on the world stage. The 39-year-old Ohio senator was set to accept the vice presidential nomination late Wednesday night. He was expected to offer his life story as a son of Appalachia, reaffirming Trump’s connections to Americans who feel alienated socially, economically and politically. But even as Republicans talked of Vance as a potential heir to the “Make America Great Again” movement, Day 3 programming at the Republican National Convention made clear that Trump and his “America First” agenda define the party in 2024. The GOP landed a powerful broadside on Biden as commander in chief — but it came from Gold Star families of slain servicemembers, not from Republican elected officials. Beyond the stated themes of the night, Republicans marched eagerly into culture wars and, after mostly avoiding even allusions to the Jan.