Did Nixon actually underperform in 1968?

[TheElectoralBoobyPrize]

Good economy plus Democrats were still the nation’s majority party. The only Republican in the last 40 years to win was a WWII general. And remember that just four years prior, they had suffered their second-worst defeat in that era. Sure, they had made some gains in the midterm elections, but they were still badly outnumbered in both houses.