Glenn Reynolds: The Arizona Tragedy and the Politics of Blood Libel - WSJ.com

Shortly after November's electoral defeat for the Democrats, pollster Mark Penn appeared on Chris Matthews's TV show and remarked that what President Obama needed to reconnect with the American people was another Oklahoma City bombing. To judge from the reaction to Saturday's tragic shootings in Arizona, many on the left (and in the press) agree, and for a while hoped that Jared Lee Loughner's killing spree might fill the bill."