Jimmy Carter was the reason we got eight years of Reagan following his poor presidency and inevitable defeat in the 1980 presidential elections. Reagan mobilised a group of people that Trump also resonated with, a group of people who wanted to see America become great again; much like both of their slogans. Arguably, Trump modeled himself and his successful 2016 campaign after Reagan (actor, populist platform, surrounded themselves with corporate CEOs, appeal to evangelicals/silent majority).
Basically if Jimmy Carter had a stronger presidency, perhaps we would never have had a President Reagan nor a Reagan/Republican Revolution thus leading to not having a President Trump.
This is the perfect place for them to be having this discussion. Right here on the Jimmy Carter deathlist thread.