The election goes to the House, controlled by Democrats, who elect Humphrey President.
There is some southern Democrat dissension. Humphrey and Johnson meet with the southern Democrat caucus. Johnson has Humphrey's authority to make deals and concessions with the southern Democrats, and master deal maker Johnson puts his considerable talents in this respect to work. Johnson persuades some of the southern Democrats to come on board and support Humphrey.
Byrd uses his leverage to gain concessions from Humphrey in return for his support and influence with the southern Democrat caucus.
Humphrey/Johnson 238 EV 44% PV
Nixon/Lodge 238 EV 46% PV
Byrd/Thurmond 61 EV 10% PV