People keep saying he's "delusional." I don't think so.
According to the Neoconservative philosophy, lying to the populace is necessary in order to get them to go along with the designs of those in power, who supposedly know better than the people they govern (doesn't sound very American, does it). Even George Bush let on about this: Remember he said that if you keep telling the people the same thing (i.e., lie) over and over, they will eventually come to believe it. Apparently it worked. After lying to the people about a link between Saddam Hussein and 9/11, some people still believe it to this day. (And George Bush and Dick Cheney--especially--keep saying it, even after Bush himself admitted it wasn't so.) [SEE POST ABOVE.]
To say that Cheney is "delusional" I think lets him off the hook. He's not mentally ill. He's a contemptible lying elitist anti-democratic bastard who thinks everyone and everything is beneath him*. And he's done nothing but wreak bloody havoc on our country. He's not delusional, he's downright dangerous.
*including, judging by his own draft dodging during Vietnam, military service, which is perhaps why he has no qualms about sacrificing our soldiers in endless misadventures abroad. "I had other priorities in the '60s than military service." And who didn't--and still doesn't--have other priorities than to be cannon fodder in a senseless war?