On May 22, Hawaii held a special election to fill the vacant U.S. House seat, 1st district. Hawaii special elections do not allow parties to nominate candidates. Instead, anyone runs on a single ballot by collecting 25 valid signatures. Five Democrats, five Republicans, and four independents, ran. The leading Republican, Charles Djou, was elected with 39.4% of the vote. There is no provision for a run-off. See the returns here.
The voters cast 59% of their votes for one or another Democrat, but the Democratic vote was splintered. Democrats might have worked harder to narrow the field of Democrats, but they presume that they will regain this seat in November 2010 anyway, and the balance in the House right now is not terribly close. If this had been a Senate race, the Democratic Party would have acted differently.
This is the first time a Republican has been elected to Congress from Hawaii in many decades.