(CNN) –Democrats continue to rack up wins in unresolved races for the U.S. House.
Republican Congressional candidate Andy Barr's concession to Democratic incumbent Rep. Ben Chandler has brought Kentucky's 6th district race to a close, adding another seat to the Democratic tally.
Chandler received 119,812 votes to Barr's 119,164, a margin of victory of 648 votes. State officials will meet next week to certify the election and do not expect the vote totals to change.
Chandler, usually a reliable Democratic vote, supported the economic stimulus package and also voted in favor of the "cap and trade" plan– a big issue in a state where coal mining is a key industry. However, Chandler broke ranks with the Democrats on some high-profile issues including the health care bill and financial reform plans.
Of thirteen races left unresolved following the 2010 midterm elections, six have been decided for Democrats in the days following November 2.
With this most recent Democrat win, the Republican net gain in the House of Representatives remains static at 60 seats.
The six districts where races are still unresolved are California's 11th, California's 20th, Illinois' 8th, New York's 1st, New York's 25th and Texas' 27th.
–CNN Political Research Director Robert Yoon contributed to this report.