WASHINGTON, Nov 9 (Reuters) - Republicans on Saturday appeared close to clinching control of the U.S. House of Representatives, a critical element for President-elect Donald Trump to advance his agenda when he returns to the White House in January. With votes still being counted from the Nov. 5 general election, Republicans had won 212 seats in the 435-member House, according to Edison Research, which projected on Friday night that Republican Jeff Hurd had enough votes to keep Republican control of Colorado's 3rd congressional district. Republicans need to win six more seats to keep control of the House and they already...