NEW HAVEN, Conn. – Rep. Ro Khanna, the California Democrat who likely harbors national ambitions in 2028, is turning up the volume in his broadsides against Vice President JD Vance, the heir apparent to President Donald Trump. In two high-profile speeches this week – in the vice president’s home state of Ohio on Monday and Tuesday at Yale Law School, where both politicians earned their legal degrees – Khanna trained his verbal fire on Vance....