Emanuel allies insist that he has done much good for the city but it’s clear from the headlines that the dominant story of his time in office so far is the rising murder rate. The Chicago homicide rate in January was its highest in more than a decade and the Windy City has become a national talking point — and not in a good way — when it comes to violence. ... A Crain’s/Ipsos poll out Thursday finds that the mayor’s popularity has fallen sharply since voters were last surveyed in September: Just 2 percent of Chicagoans surveyed said they...