In this sense, he's a scary guy.
If he does not think he is lying then he is not. Lying is knowingly providing a false information. If you believe what you are saying is true then you are not lying you or only mistaken.
Okay so I'm being semantically trivial.
Three or so years back I posted a list of sociopathic traits here on FR. I inferred that BOTH Bill and Hillary made a perfect sociopathic couple. I wish you could've seen my finger as I hit the enter button. I did it with fear and trepidation. A number of people thought I was crazy and stupid, because I happened to use the word psychopath. But, there were some people who got it back then.
Traits of a Psychopath:
charming
persuasive
slick
smooth
glib
egocentric
arrogant
shameless
power hungry
charismatic
electrifying
never gets embarrassed
always blaming others
remorseless
no regrets
deceitful
manipulative
lies very easily
fraudulent
self-assured
brazen
bold
guiltless
need for excitement
adept at covering tracks
boastful
cold
self-sufficient
known for verbal quirks
known for intense eye contact
very intimidating
"above the law"
act as if normal laws do not apply to them
very sexually promiscuous
unconcerned about others feelings
unfazed by possibility of being found out
sense of omnipotence and entitlement
complains about media treatment
skilled wordsmiths
stunning lack of concern for the devastating effects their actions have on others
not humiliated by public disclosure as a liar and a cheat
skilled at masking emotions
I made a list of each trait that Bill has and then made another list of traits that Hillary has. Each of them are missing four traits from the list BUT they are not missing the same traits.
Conclusion: Bill and Hillary are a perfect psychpathic couple.