Despite a heavy period of news that included the Boston Marathon bombings and the Jodi Arias trial, MSNBC's second-quarter ratings plunged to their lowest level since 2007. In primetime, MSNBC drew an average of 584,000 total viewers and 196,000 viewers in the key 25-54 age demographic. Those numbers were down 16% and 12%, respectively, from the second quarter of 2012. And they accounted for quarter lows not seen since the fourth and second quarters of 2007, respectively. The network had seen signs of this coming in some dreadful monthly ratings, particularly in May. The same factors contributed to the network's...