By Gram Slattery and David Morgan WASHINGTON (Reuters) -Republican Kevin McCarthy on Friday picked up support from right-wing hardliners in the U.S. House of Representatives who had blocked his speakership bid, but it was not enough to end the deepest congressional dysfunction in more than 150 years. In a 12th round of voting in four days, 14 Republicans who previously opposed McCarthy voted for him in a sign that his prospects may be improving after he offered the holdouts a range of concessions that would limit his clout if he succeeds in becoming speaker of the House. But seven fellow Repub…