By David Morgan WASHINGTON (Reuters) -Republican Kevin McCarthy, who won and lost the role of speaker of the U.S. House of Representatives in a tumultuous nine months this year, said on Wednesday that he will leave Congress, bringing an end to his 17-year congressional career. “I have decided to depart the House at the end of this year to serve America in new ways,” McCarthy, 58, wrote in a Wall Street Journal column. “It often seems that the more Washington does, the worse America gets,” said McCarthy, who was ousted as speaker by hardline Republicans in early October. “The challenges we face…