2006Final results
2006 election for Delaware's at-large District
U.S. House · Delaware
Michael Castle (R) won with 57.2% of the vote, defeating Dennis Spivack (D) by 18.4 points.
Michael CastleRepublican · winner
57.2%143,897
Dennis SpivackDemocrat
38.8%97,565
Karen Hartley-NagleIndependent
2.3%5,769
Michael BergGreen
1.8%4,463
251,694 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 2006
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Dennis SpivackMichael Castle
$388.9K
Raised by the campaign
$1.3M
$386.9K
Spent by the campaign
$1.1M
$2K
Cash on hand
$1.2M
Other candidates' campaigns: Michael Berg $37.8K.
Campaign money: FEC, through Dec 31, 2006.
Source: FEC campaign filingsUpdated Dec 31, 2006
The candidates
Michael Castle (R)Dennis Spivack (D)
Also on the ballot: Karen Hartley-Nagle (Independent), 2.3%; Michael Berg (Green), 1.8%