East Bay Democratic Congressman Jerry McNerney has surged ahead of Republican David Harmer thanks to thousands of ballots recently tabulated in Alameda County. McNerney now leads Harmer by 2,226 votes, a gain of about 1,600 since Tuesday. And it appears that nearly all of it is due to Alameda County. During the past several days, as the county registrar has counted about 85,000 late absentee and provisional ballots, McNerney picked up 2,480 more votes than Harmer — 5,777 to 3,297.