Mr. Honold also pointed out that the district voted for Democratic presidential nominees Sen. Barack Obama in 2008 and Sen. John Kerry in 2004.
Mr. Maffei said in concession that he makes no apologies for his positions on economic-stimulus spending, the health care bill and financial reform.
“My only regret is that there were not more opportunities to make health care more affordable to people and businesses and get more resources to the region for needed public projects,” he said.
The two remaining House races are New York’s 1st District and California’s 11th District, where Democrats are expected to win.
The New York race between GOP challenger Randy Altschuler and four-term Democratic incumbent Rep. Tim Bishop remains too close to call. Mr. Bishop now leads by roughly 235 votes, but the outcome reportedly will not be certified until next week when a court addresses roughly 2,000 contested ballots.
In California, Democratic incumbent Jerry McNerney has a sizable lead over GOP candidate David Harmer. Mr. McNerney has already declared victory, but the results have not been certified, and Mr. Harmer is considering a recount. The district includes the state’s San Joaquin Valley.