Dictionary.com defines a pathological liar as "a person who lies to the point of it being considered a disease or condition, an abnormally habitual liar."


Most politicians tend to stretch the truth a bit while they are in office.  Whether is is George Bush's assertion that "Iraq has WMD's" or Bill Clinton's "I did not have sexual relations with that woman," examples can be found throughout American history.  The distinction lies in the last part of the definition quoted above: an abnormally habitual liar.