1960 Underwood/Dirksen (R) vs. Johnson/Humphrey (D)

[MATTROSE94]

Cecil Underwood would most likely win, although LBJ would probably do better in the Deep South and West and might even carry California. On a side note, I always thought that in a scenario where Richard Nixon is elected in 1960 and assassinated in 1963, Henry Cabot Lodge Jr. would have picked Cecil Underwood as his Vice-President when he'd run for a full term in 1964 due to his youth and the possibility of putting some of the Upper South and border states such as North Carolina, Delaware, Maryland, Kentucky and of course West Virginia into play for the Republicans.

[MATTROSE94]

Johnson agrees to a radio broadcasted debate with Underwood.  While there is no clear winner, both candidates come across as capable and their positives are enhanced.  Still, many Northerners are hesitant to support Johnson, though Humphrey helps him carry MN and RI, and comes close in NY and MA.

Underwood/Dirksen  354  52%
Johnson/Humphrey  183  47%

Your map actually seems to be pretty accurate, although I would flip Arizona, Colorado and Oklahoma to Johnson and Tennesse and North Carolina to Underwood.