Yes it’s real. What happened was Bush’s campaign staff had handed out Bush campaign T-shirts prior to the photo op, but had forgotten to check the product after delivery from the printing company.
Others speculate these were pranksters who told Jed they were supporters. Just before one of the pranksters took the photo, the rest posing with Bush, took off or unzipped their coats.
Wow. You would think one of his keepers would have stopped that photo.