Harris leads Cooley by 42,000 votes with just about 305,000 uncounted ballots remaining. So far, she has received 46 percent of the vote to cooley's 45.5 percent.
Harris's campaign spokesman says Cooley would need to win the statewide pool of remaining votes by nearly 14 percent to overcome his deficit.
Officials say most of the remaining votes are provisional ballots which have to be verified before being counted.
