By David Morgan WASHINGTON (Reuters) – A vulnerable Democrat in the U.S. House of Representatives accused her party’s leaders on Friday of undermining efforts to move forward before the Nov. 8 midterm elections on a bill to restrict members of Congress and other government officials from trading in stocks. “This moment marks a failure of House leadership — and it’s yet another example of why I believe that the Democratic Party needs new leaders in the halls of Capitol Hill,” Representative Abigail Spanberger said in a blistering statement. “Our job as elected officials is to serve the people —…