Has Political Speech Gotten Too Angry?

The shooting of Rep. Gabrielle Giffords and murder of federal judge John Roll in Arizona over the weekend has left many wondering if the heated, sometimes violent, political rhetoric commonly found on the Internet, cable television and talk radio is destabilizing our political system. But the other side of the matter is that robust political debate is necessary for a healthy democracy. But at what point does heated political debate become unhealthy? NPR reports.