Not a lot of things have gone the Democrats' way this year, but dozens of their House candidates are getting a late boost from an unusual source: the National Rifle Association. So far this year, the NRA has endorsed 58 incumbent House Democrats, including more than a dozen in seats that both parties view as critical to winning a majority. The endorsements aren't the result of a sudden love for a party with which the NRA is often at odds. Rather, the powerful group adheres to what it calls "an incumbent-friendly" policy, which holds that if two candidates are equally...
