2008Final results
2008 election for U.S. Senate in Delaware
U.S. Senate · Delaware
Joseph Biden (D) won with 64.7% of the vote, defeating Christine O'Donnell (R) by 29.4 points.
Joseph BidenDemocrat · winner
64.7%257,539
Christine O'DonnellRepublican
35.3%140,595
398,134 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 2008
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.
Joseph BidenChristine O'Donnell
$1.5M
Raised by the campaign
$116.5K
$4.9M
Spent by the campaign
$115.1K
$152.4K
Cash on hand
$456
Campaign money: FEC, through Dec 31, 2008.
Source: FEC campaign filingsUpdated Dec 31, 2008