Chris Matthews, who once giddily speculated that "at some point, somebody's going to jam a CO2 pellet' into Rush Limbaugh's head that will "explode," on Thursday called for civility in the political discourse. Speaking of the tragic shooting in Aurora, Colorado, Matthews lectured, "We need to remember that we don't despise each other, but we do despise, maybe, the arguments that are thrown up by the other side." Matthews, who, on another occasion, called Limbaugh "evil," conceded, "I know that sounds odd coming from me." He added, "I freely admit that there are people who really get to me, but...