1. Carter had support from the MSM, but they still had a virtual monopoly on information dissemination back then. The MSM was completely in the bag for Obama, even more so than they were in 2008 -- to the point of completely covering up Bengazi.
2. Massive voter fraud.
3. A good candidate who pulled too many punches and didn't stick to a conservative message.
4. A buttload of voters with no skin in the game or brains in the head.
5. A deficient ground game.
This is how Barry got the keys to the kingdom.