Big fan of election and demographic numbers since 2006
 

1966 United States Congressional Elections – South Dakota

United States Senate – GOP Hold

Karl Earl Mundt (R-inc) – 150,51766.28%

Donn H. Wright (D) – 76,56333.72%

Total Votes – 227,080100.00%

United States House of Representatives – District 1 – GOP Hold

Ben Reifel (R-inc) – 80,59266.70%

Francis Richter (D) – 40,23633.30%

Total Votes – 120,828100.00%

United States House of Representatives – District 2 – GOP Hold

Ellis Yarnal Berry (R-inc) – 63,06360.51%

Jack P. Allmon (D) – 41,15539.49%

Total Votes – 104,218100.00%

Source: Office of the Clerk of the United States House of Representatives