The military industrial complex literally sabotaged the Iran hostage negotiations in order to drag it out to cost Carter the White House, just to make sure they would get some tax cuts in the next administration.
Meanwhile, Trump has the conservative rage media machine operating 24 hours a day, 7 days a week, 365 days a year, with an unlimited budget and a never-ending Army of Internet trolls who are either evil enough to say anything or dumb enough to believe anything. He also has the literal KGB (FSB) looking out for him with a steady stream of free money, intelligence, and all manner of honeypotting, extortion schemes, and outright violence. Trump has Fox News and Twitter literally tripping over themselves to try and make sure he wins. Fox spent $787 million to settle a lawsuit so they could lie their asses off for Trump. Carter never had help anywhere even close to that.