According to the California Secretary of State, there are at least 48,000 (perhaps 55,000) uncounted votes remaining in CA CD4 (Charlie Brown vs. Tom McClintock). Here is a pdf that lists the current number of unprocessed votes by county. It's updated several times a day.
The counties of El Dorado, Nevada and Placer have yet to process 48,000 votes (16%) out of 307,000 votes cast in those counties! I projected the split of uncounted votes in each county based on the ballots already counted. Under this scenario, Brown can erase McClintock's current 709-vote margin. However, if he does, it will be by the slimmest of margins. In this spreadsheet scenario, Brown would win by only 44 votes.
This race could be decided either way by less than 100 votes. We may not know the winner until the offical canvass end date in about 4 weeks.
Thank goodness for California's relatively liberal Nevada County, an oasis of blue in a sea of red counties in CD-4. The cities of Truckee, Grass Valley and Nevada City and the rest of the county cast over 57% of their votes for Charlie Brown. Now that reinforces why they are on my list of favorite bed-and-breakfast destinations.