NEW YORK (AP) — Chris Christie is everywhere. The former New Jersey governor and onetime Republican presidential candidate denounced “conspiracy theorists” during a September appearance at the Ronald Reagan Library in California. He followed up with a speech this month to influential Republicans in Las Vegas, warning that the party will only succeed if it offers a “plan for tomorrow, not a grievance about yesterday.” In between, he’s been interviewed by everyone from Laura Ingraham on Fox News to David Axelrod, a former adviser to President Barack Obama, on CNN. On its face, Christie’s publicity campaign is in service of...