Three-quarters of Americans agree that people like themselves have too little influence in Washington, rare unanimity across political, economic, racial and geographical lines and including both those who approve and disapprove of President Donald Trump, according to a new poll by The Associated Press-NORC Center for Public Affairs Research. Majorities also don’t have a great deal of confidence in most of the nation’s institutions. That’s especially true of Congress, which takes the biggest hit, and the presidency.