Anti-Trump Republicans are preparing to launch a broadcast TV ad in a handful of swing-state suburbs urging Donald Trump to quit the presidential race so the party can replace him with a more electable nominee. The ad, titled "Keep Your Word," features footage of Trump during the Republican primary in which he suggested he'd drop out if he saw his poll numbers decline. The 30-second spot is marked for a limited run on broadcast networks in suburban Florida, Virginia, Ohio and Michigan, according to Regina Thomson, a Colorado Republican activist and leader of Free the Delegates, the organization that failed...