Today, NPR released a poll of 48 competitive congressional districts – the ones that will decide control of the Congress. It shows the Democrats with a large lead three weeks before the election, even in the 38 Republican-held seats. This bipartisan survey was conducted jointly by Stan Greenberg for Greenberg Quinlan Rosner and Glen Bolger for Public Opinion Strategies, with POS fielding the survey. Neither NPR nor POS is responsible for the comments below.