Here is the latest tally from the LA County Registrar-Recorder, as of 11 p.m. PDT:
JANICE HAHN DEM 30,545 56.83
CRAIG HUEY REP 23,207 43.17
TOTAL PRECINCTS 261 PRECINCTS REPORTING 127 48.66
Even were the precincts reporting overwhelming from Hahn strongholds (we don't know which precincts have or have not reported), barring an extremely unlikely vote distribution in the outstanding precincts, there are not enough outstanding votes for Huey to overcome Hahn's 13.66% lead.
Hahn's campaign, which focused on green job growth and on painting her opponent as a Tea-Party extremist who used his direct-mail marketing business to defraud seniors, and who would vote to dismantle Medicare should he be elected, appears to have been effective in the coastal district (stretching from San Pedro in the south to Venice and Marina del Rey to the north) which is strongly Democratic, but fairly moderate overall.
Huey's campaign, which seemed to focus on painting Hahn, a Los Angeles City Councilwoman (and member of a family which has given Los Angeles several prominent elected officials) as someone who went easy on, or did special favors for, gang members. That line of attack, which may have worked against someone less well known, apparently fell flat for Huey.
UPDATE, 11:45 p.m. PDT:
With 100% of the vote counted, Janice Hahn has been elected to the U.S. Congress, representing the 36th CD (California).
Final, unofficial vote count from the Registrar-Recorder: