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On election night, it looked like Rep. David Valadao had survived a close shave and was destined to return to Washington for his fourth term.

But on Wednesday, when Fresno County announced its latest vote totals, the Hanford Republican found himself in an increasingly harrowing cliff-hanger against Democrat TJ Cox, with his lead in the Central Valley district shrunken to 447 votes. Thousands remain to be counted.

Valadao, a repeated Democratic target, finished election night with a lead of nearly 4,440 votes. Cox, an engineer and a business owner who unsuccessfully ran for Congress in 2006, has steadily gained ground in the 21st Congressional District ever since.

The trend is consistent with historic patterns showing Republicans in California tend to vote early and Democrats later, meaning their mail ballots continue to stream in past election day. Under California law, lawful ballots postmarked up to midnight on Nov. 6 will be counted.

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