2018Final results
2018 election for U.S. Senate in Massachusetts
U.S. Senate · Massachusetts
Elizabeth Warren (D) won with 60.3% of the vote, defeating Geoff Diehl (R) by 24.2 points.
Elizabeth WarrenDemocrat · winner
60.3%1,633,371
Geoff DiehlRepublican
36.2%979,210
Shiva AyyaduraiIndependent
3.4%91,710
2,707,090 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Elizabeth WarrenGeoff Diehl
$25.8M
Raised by the campaign
$3M
$19.6M
Spent by the campaign
$3M
$11.1M
Cash on hand
$8.9K
Other candidates' campaigns: Shiva Ayyadurai $5M.
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018