2010Final results
2010 election for Delaware Senate District 9
Delaware State Senate · Delaware
Karen E. Peterson (D) won with 71.5% of the vote, defeating Robert S. Johnston (R) by 42.9 points.
Karen E. PetersonDemocrat · winner · incumbent
71.5%8,008
Robert S. JohnstonRepublican
28.5%3,196
11,204 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 2010
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET