Conservative radio talk show host Mark Levin has put out a stunning challenge to those left-wing media personalities accusing conservative talk radio stars and Sarah Palin of encouraging murder. First, he offered $100,000 to Chris Matthews to find any example where Sarah Palin or Levin himself had "promoted the murder of anybody." The direct challenge to Matthews took place shortly after Levin had played clips of Matthews suggesting Levin's passionate radio shows were "angry" and apparently implying that Levin's shows and those of talker Michael Savage had some responsibility for the Tucson murders. The allegation came on the heels of...