Why is former President Donald Trump in a neck-and-neck campaign against Vice President Kamala Harris despite a slate of scandals that include a criminal conviction, an ally’s reported pro-slavery porn site commentary and an attack on the U.S. Capitol critics commonly call a coup? To quote another former president’s campaign guru, “It’s the economy, stupid.” That’s the takeaway from CNN analyst Stephen Collinson Monday morning from recent polls showing Trump maintaining steady numbers in key swing states even as his rhetoric — specifically when aimed at Haitian immigrants — becomes more outlan…