President Richard Nixon (R-CA) / Vice President Spiro Agnew (R-MD) ✓
Senator Edmund Muskie (D-ME) / Senator Walter Mondale (D-MN)
Carter (if nominated) picks someone else like John Glenn, Frank Church, or Henry Jackson as his running mate in 1976. There's bigger implications for Muskie winning the nomination in the first place, though: did Nixon not interfere in the primaries? No Watergate?
I think this map might be too kind to the Dems. I doubt they'd do that well in the Pacific NW & Midwest. McGovern is clearly the floor for Dems in 1972 but I'm not sure the ceiling would be much higher with Nixon's popularity at an all-time high around the election.