Just like when Rush's hero, Ronald Reagan lost 26 seats in his first moid-term election.
Amid a very weak economy that didn't turn until '83. S&P + over 10% on the year should mean a great night for incumbents.
Reagan lost seats in that election because his tax cuts hadn't kicked in and the country was just coming out of a pretty difficult recession. The great bull market of the 1980's got started in August 1982. And Reagan's great accomplishments in transforming the military would come years later. No comparison to this mid-term election.
The difference being it was expected, it didn't change control of Congress, and the Dems in his day weren't so rabidly anti American, although they were getting there. Ted Kennedy was leading them, but they still had lots of Yellow Dog Southern Dems in the party in those days. Many or even most of those seats were in the South.
The darker green represents states with 3-5 seat gains for the Dems, while the lighter green shows 1-2 seat gains.