2004Final results
2004 election for California's 49th District
U.S. House · California
Darrell Issa (R) won with 62.6% of the vote, defeating Mike Byron (D) by 27.6 points.
Darrell IssaRepublican · winner
62.6%141,658
Mike ByronDemocrat
34.9%79,057
Lars R. GrossmithLibertarian
2.5%5,751
226,466 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 2004
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.
Mike ByronDarrell Issa
$66.9K
Raised by the campaign
$871K
$69K
Spent by the campaign
$883K
$0
Cash on hand
$232K
Campaign money: FEC, through Dec 31, 2004.
Source: FEC campaign filingsUpdated Dec 31, 2004