Photo by Boston City Walk The Washington Business Journal reported today that MASN has signed a multi-year deal with DC 50 which will allow 20 Washington Nationals games to be aired on broadcast and cable each season. DC 50 will also air MASN’s pre and post game show, Nats Xtra. The article quotes Todd Webster as saying, “This agreement will bring more and better distribution for Nationals games, more marketing and promotion for the…