2006Final results
2006 election for South Dakota Governor
Governor · South Dakota
Mike Rounds (R) won with 63.1% of the vote, defeating Jack Billion (D) by 26.1 points.
Mike RoundsRepublican · winner
63.1%206,990
Jack BillionDemocrat
36.9%121,226
328,216 votes
Source: Algara, Carlos; Amlani, Sharif (Harvard Dataverse)Updated Oct 5, 2026, 12:23 AM ET
The seat over time
D − R margin in this seat's races around 2006
Races before and after
Source: Algara, Carlos; Amlani, Sharif (Harvard Dataverse)Updated Oct 5, 2026, 12:23 AM ET