Rep. Solomon Ortiz (D-Texas) conceded defeat to Republican challenger Blake Farenthold late Monday after the recount he requested barely made a dent in the Republican’s election night lead. Farenthold’s final margin of victory stood at 648 votes.

Farenthold’s victory completes one of 2010’s biggest upsets on the House side and brings the number of GOP House gains this year to 62.

Another four House races are still outstanding with two New York congressional contests headed to the courts. Rep. Tim Bishop (D-N.Y.) leads by more than 250 votes over Republican Randy Altschuler, but the two are battling over challenged absentee ballots.

Elsewhere in New York, Rep. Dan Maffei (D-N.Y.) trails Republican Ann Marie Buerkle, who appears on the verge of victory in that race with a lead of more than 500 votes.

Lawyers for both campaigns are due in state Supreme Court on Tuesday over several hundred contested ballots. Maffei might also still ask for a full hand recount of ballots

And in California, Reps. Jerry McNerney (D) and Jim Costa (D) both lead their Republican challengers who have yet to concede.

Republicans won back a House majority in the midterm election after four years in the minority.

Farenthold defeated a 14-term incumbent in Ortiz. Under Texas law, Ortiz will bear the cost of the recount because he came out on the losing end.