Rep. Jerry McNerney, D-Pleasanton, has officially won re-election to a third term in Congress.
Contra Costa, the fourth and final county to report in the 11th Congressional District, certified its election results Tuesday, widening McNerney's lead over GOP nominee David Harmer to 2,658 votes.
The final vote tally: McNerney, 115,361 votes, or 47.97 percent; Harmer, 112,703, or 46.86 percent; and David Christensen, American Independent, 12,439, or 5.17 percent.
McNerney had been trailing Harmer in Contra Costa County, but overtook him as the final votes were tallied. He beat Harmer by 92 votes in Contra Costa and prevailed in Alameda and Santa Clara counties.
Harmer won in San Joaquin County by 4,493 votes, or 3.6 percentage points. This result could prove telling for McNerney's 2012 re-election prospects, as redistricting next year will almost certainly shift his district's boundaries eastward.
While the final vote count was tight -- 1.1 percent of the 240,503 votes cast -- it probably was not close enough to warrant an expensive recount.
Any registered voter may request a recount, but must pay for it. If the election results are overturned as a result of a recount, the county will refund the money.
The Republican Party had been watching this race closely, although both parties sent observers to watch the vote counting in all four counties.
The full county results are posted on its website,