The Constitution gives members of Congress immunity from lawsuits for anything they say in the course of congressional debate. One member of Congress can say anything he wants to about anyone and not be sued for slander. And by custom, the same goes for anything a politician says outside of Congress. Would eliminating this immunity make politicians more civil towards each other? Would politicians be less likely to use inflammatory rhetoric (either in office, or while campaigning) if they knew their opponents could (and would) sue them for what they say or publish?