The Republican challenger of the last undecided Congressional seat has regained her lead over the Democratic incumbent in a race that remains on razor’s edge. Claudia Tenney, who held New York’s 22nd Congressional District seat for a single term and narrowly lost reelection in 2018 to Rep. Anthony Brindisi, said Wednesday that she is leading by just 29 votes. Tenney’s small but widening advantage came after Oneida County finished its canvassing of about 1,800 affidavit ballots that were previously left uncounted. Those ballots were included in the recount under a Dec. 8 order from state Supreme Court Justice Scott DelConte. The completion of Oneida County’s tally marks the end of the counting across the NY 22nd, nearly two months after the general election. As of Wednesday, the unofficial results for the district, which covers all or part of eight upstate New York counties, have Tenney leading with 155,862 votes and …