2000Flipped from RepublicanFinal results
2000 election for U.S. Senate in Delaware
U.S. Senate · Delaware
Thomas R. Carper (D) won with 55.5% of the vote, defeating William Roth (R) by 11.8 points, a seat Republicans won last time.
Thomas R. CarperDemocrat · winner
55.5%181,566
William RothRepublican
43.7%142,891
J. Burke MorrisonLibertarian
0.3%1,103
Mark E. DankofConstitution
0.3%1,044
Robert MattsonNatural Law
0.1%389
326,993 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 2000
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.
Thomas R. CarperWilliam Roth
$2.6M
Raised by the campaign
$4.3M
$2.6M
Spent by the campaign
$4.4M
$30.8K
Cash on hand
$142.3K
Campaign money: FEC, through Dec 31, 2000.
Source: FEC campaign filingsUpdated Dec 31, 2000
The candidates
Thomas R. Carper (D)William Roth (R)
Also on the ballot: J. Burke Morrison (Libertarian), 0.3%; Mark E. Dankof (Constitution), 0.3%; Robert Mattson (Natural Law), 0.1%