(n.) As insanely optimistic as Congresswoman Katherine Harris. Usually characterized by an overly optimistic estimation of someone's chances of achieving success.

a) a person interested in bringing about the Apocolypse. Only slightly less dangerous than global warming,
"Katherine Harris crazy" is vetrinarilly synonymous with an animal being "rabid." See also Adolf Hitler; Pol Pot; Joseph Stalin; Sauron; George W. Bush; Emperor Palpatine; Blue Duck; the two Asiain-American dudes that always drag race John Cusak's character (Lane Meyer)in Better Off Dead; Khhhhaaannnnn!!!!!; evil genius Vince McMahon; Lex Luthor; the kid in second grade who kicked my ass