Former GOP vice presidential candidate Sarah Palin on Monday called for President Obama to fire his chief of staff, Rahm Emanuel, because of an offensive comment he reportedly made. At an August strategy session of liberal groups and White House aides, the Wall Street Journal recently reported, Emanuel told liberals they were "F-ing retarded" for planning to air attack ads against conservative Democrats opposed to health care reform. Palin, whose youngest child has Down Syndrome, said in a Facebook note that "our president is doing himself a disservice by seeming to condone Rahm's recent sick and offensive tactic." "I would...